Across:
1 Reverse decision (CHANGE OF HEART) to go for a transplant (CHANGE OF HEART),
10 That woman (HER-) with energy (-E-) turns it around (= reverse indicator) (turns ‘it’ around = -TI-) at speed of light (-C) (HERETIC) out of belief? (HERETIC),
11 The fastest one spotted (fastest animal = CHEETAH) finishing off (r) the best spirits (cheer) (‘cheer’ without ‘r’ = CHEE-) at Panama (Panama hat) Retreat (= reverse indicator) (hat = -TAH) (CHEETAH),
12 One of the bright lights (NEON) in libertine ontology (in ‘libertiNE ONtology’ = NEON),
13 Confuse (ADDLE) theologian (Doctor of Divinity = -DD-) consumed by the drink (ale = A-LE) (ADDLE),
15 Shoot (shoot! = DARN) series out of dreariness (‘series’ out of ‘dreariness’ = dran = DARN),
17 Found in Bucharest? (in ‘buchAREst’ = are) About (= reverse indicator) (are = ERA) time! (ERA),
19 Fair amount of (half) riot (half of ‘RIot’ = -RI-) taken in by viewers (eyes = EY-ES) (EYRIES) from lofty shelters? (EYRIES),
21 Unnerve someone (RATTLE) on ramparts of Rathangan Castle (on the ramparts of ‘RAThangan casTLE’ = RATTLE)
22 Turns up (= reverse indicator), no (no = -ON) doctor (rig = -G IR-) gets to address (IP address = PI-) (PIG IRON) crude types going into bars (PIG IRON),
23 Highwayman (BANDIT) Bar (BAN-) is for returning (= reverse indicator) heads, teachers, instructors, disciplinarians? (for returning heads ‘Teachers Instructors Disciplinarians’ = tid = -DIT) (BANDIT),
25 Sweep over (ENGULF) daft (= anagram indicator) lunge (lunge = ENGUL-) by top footballer (top ‘Footballer’ = -F) (ENGULF),
27 Found in mushroom sauce (CEP) in Nassau, dished out of saucepans (‘Nassau’ dished out of ‘saucepans’ = cep = CEP),
29 Starting off (c), sunblock (‘cloud’ without ‘c’ = LOUD) is hard on the ears (LOUD),
30 Brush (brush) off (= anagram indicator) (brush = SHRUB) a type of hydrangea (SHRUB),
31 An element (ZINC) from Ulster (NI = -IN-) found in Czech Republic (CZ = Z-C) retiring (= reverse indicator) (ZINC),
34 Heat the last (‘heaT’ the last letter = T-) of the poultry (chicken), remove the head (c) (‘chicken without ‘c’ = -HICKEN) (THICKEN), and add roux (THICKEN),
35 Asian- (LAOTIAN) -American City (Los Angeles = LA-) Institute (-I-) in military alliance (NATO) set back (= reverse indicator) (NATO = -OT-AN) (LAOTIAN),
36 Looked at the table differently (CHANGED PLACES), as genetically modified (CHANGED) fish (plaice), by the sound of it (= homophone indicator) (‘plaice’ = ‘place’ = PLACE-), is the ultimate (‘iS’ the ultimate = = -S) (CHANGED PLACES).
Down:
2 Keep in mind (HARBOUR) maximum projected obvious seconds (‘mAximum pRojected oBvious’ seconds/second letters = -ARB-) in 60 minutes? (hour = H-OUR) (HARBOUR),
3 Served up (= reverse indicator) some of the most undesirable (some of the ‘moST UNdesirable = stun = NUTS) party snacks (NUTS),
4 Don’t let the secret recipe get out (ENCODE) for starter of Emerald (starter of ‘Emerald’ = E-) Fish (-COD-) caught in northeast (-N-E) (ENCODE),
5 I’d advise you not to look for this bright spot (FACULA) in The Sun (FACULA),
6 Banks of reservoirs in Zimbabwe overflowing (= reverse indicator) (banks of ‘REservoirs in zimbabWE’ overflowing = rewe = EWER) – which one is holding water? (EWER),
7 Withdraw (RETRACT) retweet (RT = R-T) about Oriental (East = -E-) Jaguar (car) up (= reverse indicator) (car = RAC) on top of tree (top of ‘Tree’ = -T) (RETRACT),
8 Substitute (CHANGE-) has the talent (-ABILITY) (CHANGEABILITY), for instance, to play in defence or lead the attack erratically (CHANGEABILITY),
9 What the set designer is capable of (CHANGE OF SCENE) will give you a different view (CHANGE OF SCENE),
14 Removes the liquid (DRAINER) from most of (y) fish (ray) (‘ray’ without ‘y’ = -RA-) in ismall cafe (diner = D-INER) (DRAINER),
16 Turns up (= reverse indicator), gym (PE = -EP-) in old college (Dublin Institute of Technology = DIT = T-ID) (TEPID) is not so hot (TEPID),
18 Found in Mexican national (found in ‘mexiCAN NAtional’ = CANNA) flower (CANNA),
20 Settle down (SIT) or retiring (= reversal indicator) in The Blasket Islands? (in ‘the blaskeT ISlands’ = tis = SIT),
21 Consumed by gastroenteritis (consumed by ‘gastROEnteritis’ = ROE) from fish eggs (ROE),
24 Take care of (NOURISH) flip (= reversal indicator) switch (on = NO-) opening up (opening ‘Up’ = -U-) the locals (Irish) starting off (i) (‘Irish’ without ‘i’ = -RISH) (NOURISH),
26 Exploit (UTILISE) tips for tourism in Laos, India (tips for ‘Tourism In Laos India’ = TILI-), in America (US = U-S-) and Spain (-E) (UTILISE),
27 All sides today (CHANGE on all sides of today’s grid) rotate (CHANGE),
28 Stop the car (PULL UP) or brake (pull up)? It’s the same whichever way you look at it! (= palindrome indicator) (‘pull up’ is spelt the same back-to-front: PULL UP),
32 Introduce singing (introduce ‘Singing’ = S-) family (-KIN) (SKIN) to the largest organ (SKIN),
33 Drink (SODA) to heir from Rhodesia? (‘heir’ from ‘Rhodesia’ = odsa = SODA).