The Sunday Crossword No 3178, Sunday 28 Nov 2021

ACROSS

1   Unstraps a little sarong shifting in warm spots (8) SUNTRAPS (+s)SUN(-s)TRAPS

5   Primarily, full lists of regions' Amaryllidacaea, etc! (6) FLORAE Acrostic &lit

10 Tense, like a guitar neck? (7) FRETFUL [DD]

11 They're seen with soldiers, say, getting George Cross: happy times (7) EGGCUPS {EG}{GC}{UPS}

12 Sides of langoustine consumed ... off-colour in French city (5) LILLE {La...nE} over {ILL}

13 US cop story, not right to reboot film (9) OCTOPUSSY {US+COP+STOrY}* 

14 Sees chest heaving, having eaten undercooked snack (6,6) CHEESE STRAWS {SEES+CHEST}* over {RAW}

18 How rotor-head's spinning is a problem (4,3,2,3)  HARD ROW TO HOE*

21 In home counties these days, smallest part unsullied (4-5) SNOW-WHITE {SE} over {NOW}{WHIT}

23 Some nonlinear systems offering approaches (5) NEARS [T]

24 'Podgy' (mostly fat) servicemen getting starter of hamburgers (7) LARGISH {LARd}{GIS}{Ha...r}

25 'A very European' fury? That's mean (7) AVERAGE {A}{V}{E}{RAGE}

26 Go back into – or out of – employment (6) RESIGN [DD]

27 Face cry that's voiced for pasta topping (8) MEATBALL (~ meet bawl)

DOWN

1   Sneaky, frequently hiding piano (6) SOFTLY {S{OFT}LY}

2   Tease a little weak-kneed learner (6) NEEDLE [T]

3   First-year divinity student's a sweetie! (9) REFRESHER [DD]

4   Upon swell, exercising rowers – what each must do? (4,4,6) PULL ONES WEIGHT {UPON+SWELL}*{EIGHT} Semi&lit

6   Help large English dog that's upset (3-2) LEG-UP {L}{E}{PUG<=}

7   Primitive painter showing topless bride's outfit (8) ROUSSEAU tROUSSEAU

8   One writes 19th letter a year before first (8) ESSAYIST (ess){S}{A}{Y}{1ST}

9   Does roast with beef, batter and timing advice for chef? (4-6,4) BEST BEFORE DATE {DOES+BEEF+BATTER}*

15 Model superlatively lusty: most problematic (9) THORNIEST {T}{HORNIEST}

16 He painted his mum, a referee at times (8) WHISTLER [DD]

17 A Queen's wavy patterns in wardrobes (8) ARMOIRES {A}{R}{MOIRES}

19 Country's athletic club taking in judo practitioner, amateur ascendant (6) CANADA {A{DAN}{A}C}<=

20 A second spring besides (2,4) AS WELL {A}{S}{WELL}

22 Loudly call for squeeze (5) WRING (~ring)

Reference List

Home counties = SE, Servicemen = GI'S, Large = L, English = E, Year = Y, Model = T, Queen = R, Athletic club = AC, Amateur = A,  Second = S