The Sunday Crossword No 3120, Sunday 11 Oct 2020

ACROSS
1   High, as mature hams (8) AMATEURS*
5   Working with American on island, heading west (6) USABLE {US}{ELBA<=}
10 Level up late, audacious to some extent (7) PLATEAU [T]
11 Unsettled, startled, devoured abruptly (7) OVERDUE DEVOUREd*
12 On 2nd of March, sit back for storyteller (5) AESOP {mArch}{POSE<=}
13 A better piano? Fitzgerald is unaccompanied (1,8) A CAPPELLA {A}{CAP}{P}{ELLA}

14 Failure for starter, summer pudding: one's not swallowed much (7,4) NOBODYS FOOL {NOBODY}{Su...r}{FOOL}
18 Manic choral arrangement befitting royals (11) MONARCHICAL*
21 Races after admiral, oddly wanting to make speeches (9) DIATRIBES {TRIBES}<=>{aDmIrAl}
23 A Brontë vacuously missing the point (5) EMILY EMptILY
24 Customer spluttering 'Rudeness!' cut short (3-4) END-USER RUDENESs*
25 Horribly legally decapitated (7) AWFULLY lAWFULLY
26 Greek character, politician, heartless tiny fool (6) NUMPTY {NU}{MP}{TinY}
27 It's likely that Ray's idea is kinky (1,4,3) I DARE SAY*

DOWN
1   Request loudly a spa treatment (6) APPEAL (~ a peel)
2   Tennis champ's a lot of fun in Spain, I agree (6) AGASSI {A}{GAS}{SI}

3   Perhaps Magritte, creator of unsettling images, the old revolutionary, produces revelation (3-6) EYE-OPENER {RENE}{POE}{YE}<=
4   Fruit salad ingredient? That's not technically a fruit etc etc (7,7) RHUBARB RHUBARB {RHUBARB}{RHUBARB}
6   Expensive taste epicure has (5) STEEP [T]
7   Gall bladder – boo! – removed without hesitation (3,5) BAD BLOOD {BLADDer+BOO}*
8   Examines cocktails in the Queen Vic (8) EYEBALLS (~highballs)
9   Cruddy actor was cast as Chicken (7,7) COWARDY CUSTARD*
15 Horribly evil friar's removed a tree (6,3) SILVER FIR {EVIL+FRIaRS}*

16 A little insect eaten by son (8) SMIDGEON {S{MIDGE}ON}
17 Everyman is grabbing ten and dancing together (2,6) IN TANDEM  {I'M} over {AND+TEN}*
19 Searches for weapons (6) RIFLES [DD]
20 Primarily, something your zodiac's 'yoking' gives you? (6) SYZYGY Acrostic &lit
22 Regularly defective drier's best turned off and on again (5) RESET {dRiErS+bEsT}

Reference List
Piano = P