No 12678, Monday 15 Jul 2019, Anon

ACROSS
1    Contestant to trip captain perversely (11) PARTICIPANT*
9    Substance belongs to me? Really odd! (7) MINERAL {MINE}{ReAlLy}
10 Coats for decapitated actors (6) LAYERS pLAYERS
11. Antelope begins new year amidst lazy asses (5) NYALA Acrostic

12 Fall out, quarrel with bird (7) SPARROW {SPAR}{ROW}

15 Encounter, on return, swarm (4) TEEM<=
16 Glow strangely since dance (10) INCANDESCE*
18 At a loss due to unsold pens? Dreadful! (10) NONPLUSSED*
20 Olive Ridley somewhat inactive (4) IDLE [T]
23 Mind accepts levy in United Kingdom (7) BRITAIN {BR{IT}AIN}

24 Neckwear worn at English racecourse (5) ASCOT [DD]
26 Disguised at first, nun leaves disciple (6) COVERT COnVERT
27 Unbounded lacy hair of thespian (7) ACTRESS {lACy}{TRESS}
28 In a riot, saddled king escaping (11) SKEDADDLING*

DOWN
2    Sailor trio, regular, now overseas (6) ABROAD {AB}{tRiO}{AD}
3    Charge for ring (4) TOLL [DD]
4    Special hat destroyed in kingdoms (10) CALIPHATES*
5    Talk back to, somehow drag Oriental of rank (8) PAYGRADE {YAP<=}{DRAG*}{E}
6    Limits direction of darts (7) NARROWS {N}{ARROWS}
7    Discharging man in dining (9) EMANATING {E{MAN}ATING}
8    Convict, dear, loses sex appeal on return (6) INMATE INtiMATE
13 Singlehandedly, doctor sustains regular lead (10) UNASSISTED {SUSTAINS*}{lEaD}
14 Negativist freethinker without accomplishment (9) DEFEATIST {DE{FEAT}IST}
17 Apartment supervisor has fish (8) FLATHEAD {FLAT}{HEAD}

19 Part-Nordic people at US city (7) NORFOLK {NORdic}{FOLK}
21 Shorten alien’s schedule (6) DOCKET {DOCK}{ET}
22 Tycoon introduces tea into farmyard (6) BARTON {BAR{T}ON}
25 Initially retreating from fight? Yell! (4) BAWL BrAWL

Reference List
Levy = IT, Sailor = AB, Now = AD, Oriental = E, Direction = N, Sex Appeal = IT, Alien = ET, Tea = T

GRID