No 13183, Monday 01 Mar 2021, Anon

Solution to 26A  has been deliberately left unsolved and is to be answered only by a non-regular / novice commenter, with proper annotation. Those who have answered earlier in the week, please give others a chance.

ACROSS

1   Devotees in aid of casino rebuilding (11) AFICIONADOS*

9   Heartless goon at boundary commits crime (7) OFFENCE {OaF}{FENCE}

10 Sibling, menacing, removes nail regularly (6) SISTER SinISTER

11 In Arkansas’ borders, lady remains (5) ASHES {Ar..{SHE},,aS}

12 Ineffective sailor vacates subleases at sea (7) USELESS SUbLEaSES*

15 European starts dancing at new eatery (4) DANE Acrostic

16 Doctor tempers ire at boundaries (10) PERIMETERS*

18 Withdrawing from resort with gin cocktail (10) RETREATING {RETREAT}{GIN*}

20 From the East, steal a Kamarupan language (4) ABOR {ROB}{A}<=

23 Overwhelm head constable interrupting dinner (7) SCUPPER {S{Co...e}UPPER}

24 Model father leaves or remains? (5) RELIC REpLICa

26 Head to rule without trepidation at first (6) ?T?T?E (Addendum - STATUE STATUtE - See comments) 

27 Remains of crash scattered initially at retreats (7) ASHRAMS {ASH}{RAM}{Sc...d}

28 Benevolent towards returning Mayas odd, pitiable (11) SYMPATHETIC {MaYaS<=}{PATHETIC}

DOWN

2   End up with European language lacking nuance initially (6) FINISH FINnISH

3   Heartless leader becomes cook (4) CHEF CHiEF

4   Fascinations with regular tomb meetings (10) OBSESSIONS {tOmB}{SESSIONS}

5   Pardons sailor who answers (8) ABSOLVES {AB}{SOLVES}

6   Watch over across the waters, it is said (7) OVERSEE {OVER}{SEE(~sea)}

7   Strainers in firm spacecraft (9) COLANDERS {CO}{LANDERS}

8   Deaf Ghanaian safeguards sheepskin coat (6) AFGHAN [T]

13 Let men test broadcast in colony (10) SETTLEMENT*

14 Ban of coaster is ludicrous (9) OSTRACISE*

17 Carry on action, maintain pace (4,4) KEEP STEP {KEEP}{STEP}

19 Wordlessly, feline returns to European country without animal leader (7) TACITLY {CAT<=}{ITaLY}

21 Song for dance these days (6) BALLAD {BALL}{AD}

22 Script of elite class? Not quite (6) BRAHMI BRAHMIn

25 Start off, humiliate headquarters (4) BASE aBASE

Reference List

Sailor = AB, Father = PA