Across:
1 Agricultural study of one of those in the cabbage family (ROCKET SCIENCE) – in a funny way, it’s not complicated (it’s not ROCKET SCIENCE),
10 On holiday (OUT-), fiction (-LIE-) is first read (first ‘Read’ = -R) (OUTLIER) by detached person (OUTLIER),
11 Storm (TORNADO) over (= reverse indicator) old (-O) man (Dan = -NAD-) is local nonsense (local ‘nonsense’ = rot = TOR-) (TORNADO),
12 For example, Granny (Granny KNOT) Pat is abandoning tank top (‘Pat’ is abandoning ‘tank top’ = nkto = KNOT),
13 Relish (ENJOY) for starter of lobster (hen lobster) is missing (h) (‘hen’ without ‘ h’ = EN-) – where’s the gratification in that? (-JOY) (ENJOY),
15 Type of pitch (ROCK) popular with all sides today (ROCK on all sides of today’s grid),
17 Piece (GUN) of marketing understated in part (‘marketinG UNderstated’ in part = GUN),
19 Some foodie selection (some ‘fooDIE SELection’ = DIESEL) provides fuel for our energy requirements (DIESEL),
21 Reduce (lessen) sound (= homophone indicator) (‘lessen’ = ‘lesson’ = LESSON) for tutorial (LESSON),
22 It (-IT-) is found in sun block (visor = VIS-OR) (VISITOR) although it’s alien to some of us (alien / VISITOR),
23 Bad blood (HATRED) between Meg Thatcher (between ‘meg tHATcher’ = HAT-) and revolutionary (-RED) (HATRED),
25 The means (WEALTH) to rewrite (= anagram indicator) the law (the law = WEALTH),
27 Saint George dismissed Georgian (‘Saint George’ dismissed ‘Georgian’ = ste = SET) clique (SET),
29 Cromwell’s issue, for instance (issue/child = BABY), on both sides at the Battle of Naseby? (on both sides at the ‘BAttle of NaseBY’ = BABY),
30 Transfer between banks (FERRY) for numerous people going overseas (FERRY),
31 Lasting impression (SCAR) of the extremes of the school year (the extremes of the ‘SChool yeAR’ = SCAR),
34 Mobilised (= anagram indicator) carers (carers = ARC-ERS) welcome hospital (-H-) (ARCHERS) hotshots? (ARCHERS),
35 Popular (in) revolutionary (= reverse indicator) (in = -NI-) consumed by smashing (great) State (= homophone indicator) (‘great’ = ‘grate’ = GRA-TE) (GRANITE) is similar to 15 across (‘rock’ is similar to GRANITE),
36 Shocking (ROCKING) those running the meetings (CHAIRS) (ROCKING CHAIRS) with seats presumably in the Irish Senior Citizens’ parliament? (ROCKING CHAIRS).
Down:
2 As a result (OUTCOME), Open University (OU-) scholarly volume (tome = -T-OME) covers copyright (-C-) (OUTCOME),
3 Reviews (= reversal indicator) time (-T) for the writers to use (ink = KNI-) (KNIT) to bond together (to KNIT together),
4 It’s exhausting (TIRING) for tenor (T-) from one (-I-) wedding band (-RING) (TIRING),
5 Criminal (C-ON) jumps over the top (‘Over The Top’ = -OTT-) (COTTON) with raw material used for making sheets (COTTON),
6 Investor leaves reservations (‘investor’ leaves ‘reservations’ = eras = EARS) to the listeners (EARS),
7 Produced (= anagram indicator) Narcos (Narcos = CRA-ONS) over last day (last ‘daY’ = -Y-) (CRAYONS) with colourful writers (CRAYONS),
8 What iceberg did to Titanic (ROCKED THE BOAT) caused trouble (ROCKED THE BOAT),
9 Craftsman toys (ROCKING HORSES) with Sinbad’s bird (mythical bird that appears in The Arabian Nights along with Sinbad = ROC-), Shahryar (-KING in The Arabian Nights) and a number of The Arabians (HORSES) (ROCKING HORSES),
14 Old Germanic race (Jute = JU-TE-) took over most of (t) mine (‘pit’ without ‘t’ = -PI-) at end of war (end of ‘waR’ = -R) (JUPITER), by Jove! (JUPITER),
16 Leo won’t participate in free love (‘Leo’ won’t participate in ‘free love’ = freev = FEVER) – that’s far too much excitement (FEVER),
18 Concealed by Mount Erebus (concealed by ‘mounT EREBus’ = tereb) going up (= reverse indicator) (tereb = BERET) to a nice cap (Nice/French cap = BERET),
20 Sample of holidays (sample of ‘hoLIDays’ = LID) in Cork (cork/top = LID),
21 Turns up (= reverse indicator) in The Cotswolds (in ‘the cotsWOLds’ = wol = LOW) needing a refill (LOW),
24 Heartless (b) abbot (‘abbot’ without ‘b’ = abot) knocks back (= reversal indicator) (abot = TOBA-) first course (first ‘Course’ = -C-) with cold (-C-) duck (-O) (TOBACCO) and leaves for a smoke (TOBACCO leaves for smoke/cigarette),
26 Being more fortunate than others (LUCKIER), Ulick (ulick) gets sorted (= anagram indicator) (Ulick = LUCKI-) in hospital (-ER) (LUCKIER),
27 Add zest to (SEASON) or rips off rap session? (‘rips’ off ‘rap session’ = aesson = SEASON),
28 Temperature (T-) reflects (= reversal indicator) most of (y) Gary (‘gary’ without ‘y’ = gar = -RAG-), Indiana – to begin with (‘Indiana’ to begin with = -I-), it’s cold (-C) (TRAGIC) and dreadful (TRAGIC),
32 Both sides with peppered steak (both sides with ‘PEppered steAK’ = PEAK) for one of the widows going on ahead? (widow’s PEAK hair / on a head),
33 All the numbers to be analysed (DATA) within the uplifting (= reverse indicator) confines of Sonata da Chiesa (confines of ‘sonATA Da chiesa’ = atad = DATA).