Across:
1 It’s a waste of time (ALL FOR NOTHING) to everybody (ALL) in favour of (FOR) taking on night (on night = NOTHING) work (= anagram indicator) (ALL FOR NOTHING)
10 Right (-R-) leg (leg = -GEL-) put back (= reversal indicator) in place (place = lay = LA-Y) (LARGELY) for the most part (LARGELY),
11 Pleasure (FUN-) is real (real = -ERAL) problem (= anagram indicator) (FUNERAL) for one who is late (FUNERAL),
12 Revolutionary (= reversal indicator) part of the panel display (part of the ‘panEL DIsplay’ = eldi = IDLE) is not working (IDLE),
13 Denounce (DECRY) for amount missing from documentary (for ‘amount’ missing from ‘documentary’ = dcery = DECRY),
15 They have a reputation for being wise guys (MAGI) with endless (c) tricks (‘magic’ without ‘c’ = MAGI),
17 Ground cover (SOD) returns (= reversal indicator) amidst Colorado Spruce (amidst ‘ColoraDO Spruce’ = dos = SOD),
19 Old (O-) biographies (-LIVES) (OLIVES) of those in the oil business (OLIVES),
21 She is leaving osteopath (‘she’ is leaving ‘osteopath’ = otopat= POTATO) for Spud (POTATO),
22 Graduate (PASS OUT) gets to post us a (post us a) novel (= anagram indicator) (post us a = PASS OUT),
23 Worn down (ERODED) by deed or (deed or) action (= anagram indicator) (deed or = ERODED),
25 Work casually (TEMP-) with the foreign (the = -LE) (TEMPLE) church (TEMPLE),
27 Every one (ALL) on the sides today (ALL on all sides of today’s grid),
29 Some uplifting (= reversal indicator) travel sights (some uplifting ‘travEL SIghts’ = elsi = ISLE) all at sea (ISLE),
30 Say under one’s breath (mutter) introduction taken from (m) (‘mutter’ without ‘m’ = UTTER) Express (UTTER),
31 A feather in one’s cap (plume) finishing off (e) (‘plume’ without ‘e’ = PLUM-) claret (PLUM),
34 Drug dealer (chemist) isn’t finished (t) (‘chemist’ without ‘t’ = CHEMIS-) with ecstasy (-E) (CHEMISE) to shift – the type the women go for (shift/dress = CHEMISE),
35 The lay of the land (TERRAIN) for trainer (trainer) /jockey (= anagram indicator) (trainer = TERRAIN),
36 Confused (ALL OF A FLUTTER) 100 per cent (ALL) by old (O-) foreign footballers (FA = -F A) going to Florida (FL-) State (-UTTER) (ALL OF A FLUTTER).
Down:
2 Folk tales (LORE-) by Garland (garland = -LEI) (LORELEI) linked to seductive rock music perhaps (siren on the LORELEI rock said to sing to lure sailors to destruction),
3 Agonise over (FRET) bottle of Retsina (bottle ‘oF RETsina’ = FRET),
4 What Limerick does (RHYMES) in hurling and curling sounds poetic (‘hurling and curling’ sounds poetic = RHYMES),
5 Party (do = O-D) backed (= reversal indicator) over vote (-X-) in favour of (-FOR-) (OXFORD) foreign university (OXFORD),
6 Conclusions of research you can present (conclusions of ‘researcH yoU caN presenT’ = HUNT) or pursue (HUNT),
7 New leader (‘New’ leader = N-) from Asian country (Iran = -IR-AN-) admits victory (-V-) for America (-A) (NIRVANA) could be ideal, in stately way? (idyllic state = NIRVANA),
8 Doesn’t describe Humpty Dumpty (ALL IN ONE PIECE) in concert (ALL IN ONE PIECE),
9 Where an individual gathers their thoughts presumably (ALL IN ONE’S MIND) is unreal (ALL IN ONE’S MIND),
14 Religious group (cult = C-ULT) admits losing the head (c) with fools (‘cons’ without ‘c’ = -ONS-) (CONSULT) in debate (CONSULT),
16 It holds the line (fishing reel = RE-EL) around park (-P-) (REPEL) to ward off intruders (REPEL),
18 Like a shot without saki (‘like a shot’ without ‘saki’ = lehot = HOTEL) from inn (HOTEL),
20 Down in the dumps (SAD) over (= reversal indicator) most of the (h) run (‘dash’ without ‘h = das = SAD),
21 Place (PUT) for raising (= reversal indicator) some of the quintuplets (some of the ‘quinTUPlets’ = tup = PUT),
24 Take head off (b) pimple (‘boil’ without ‘b’ = OIL) satisfactorily (WELL) (OIL WELL) – it’s bound to release all that viscous liquid (OIL WELL),
26 Shifting (= anagram indicator) plates (plates = P-LSATE) around centre of Liguria (centre of ‘ligUria’ = -U-) (PULSATE) move regularly in a beat (PULSATE),
27 A wise woman (ATHENA) back in the day (-THEN-) in teetotal organisation (AA = A-A) (ATHENA),
28 Pulse (LENTIL) lost (L-) leader of Triads (leader of ‘Triads’ = -T-) in line- (line) -up? (= reversal indicator) (line = -EN-IL) (LENTIL),
32 Roaming without man (‘roaming’ without ‘man’ = roig = GIRO) of Italian race (GIRO d’Italia),
33 Unfinished (e) draft (‘write’ without ‘e’ = WRIT) of court document (WRIT).