The Sunday Crossword No 3117, Sunday 20 Sep 2020

ACROSS
1   Fluttering leaf? As if! Sure! (4-4) FAIL-SAFE*
5   Subject is suppressing resistance ring (6) TROPIC {T{R}OPIC}
10 Conman not about to get left in prison (7) SLAMMER S(-c+l)LAMMER
11 Pensioner disrespectfully told 'not to start reckless dare' (3,4) OLD DEAR {tOLD}{DARE*}
12 Rishi's reconstruction – people allegedly lucky (5) IRISH*
13 We're told, alternatively, a conservative has debts or works (9) ORATORIOS (~ or a tory owes)
14 Actor in Shakespeare's Trouble and Strife (4,8) ANNE HATHAWAY [DD] Trouble and Strife = Wife
18 Unlikely apricot-lover? (12) VELOCIRAPTOR* &lit

21 Furore with turkey as practical joke (5,4) STINK BOMB {STINK}{BOMB}
23 Everyman, rank and fuming (5) IRATE {I}{RATE}
24 Performing male's accepted by Everyman formally (2-5) ON-STAGE {ON{STAG}E}
25 Frightful migraine, head splitting somewhere in Africa (7) NIGERIA mIGRAINE*

26 South American congress assembled ancient kingdom (6) SUSSEX {S}{US}{SEX}
27 Primarily, style Yazoo notably tried, having plenty of pep? (5-3) SYNTH-POP Acrostic &lit

DOWN
1   Geological evidence from UFOs? Silly (6) FOSSIL [T]
2   Regularly seen in mist, tall birch tilting (6) ITALIC {mIsT+tAlL+bIrCh}
3   University rejected movement of 'phony music' like Beethoven's 5th (9) SYMPHONIC {PHONY+MuSIC}*
4   Move one lorry of bananas at any cost (3,4,2,5) FOR LOVE OR MONEY*
6   Auntie's known for this: some flipping rheumatoid arthritis (5) RADIO [T<=]
7   Quiet about struggles to include Western trailers (8) PREVIEWS {P}{RE}{VIE{W}S}
8   Brief agreement written up, son's respectful gestures (8) CURTSEYS {CURT}{YES<=}{S}
9   Like Bugs when bugged? (3,1,5,5) NOT A HAPPY BUNNY [CD]
15 Walking in fog, lost, going after love, wearing belt (7,2) HOOFING IT {IN+FOG}*<=>{0} in {HIT}
16 Excuses given by European missing in attacks (8) EVASIONS {E}{inVASIONS}
17 Spies ill prepared ... (8) ELLIPSES* (Correction - ELLIPSIS* - See comments)
19 Dog holding tune, Come Together (4,2) PAIR UP {P{AIR}UP}
20 Vicar gets electronic kit to modernize (6) REVAMP {REV}{AMP}
22 Somewhere in church, reported villainous character (5) KNAVE (~nave)

Reference List
Resistance = R, About = C, Left = L, Trouble and Strife = WIFE, South = S, University = U, Quiet = P, About = RE, Western = W, Son = S, European = E