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ACROSS
 1 Expense for a business ruined 27 (9,4)
 9 Libertine following the lead of Donald Duck (5)
10 Relative: “Information technology goes fast” (5,2,2)
11 Imitate one holding back Scotsman’s garment (3,4)
12 Unending, unnecessary taunts (7)
13 I quit experiment after difficult chores entailing many instruments (10)
15 Cat associations being discussed (4)
18 Stealthily listen to the end of gramophone record (4)
20 Hell, formerly, lacking a bit of rudimentary efficiency (10)
23 Drink later. First, burn this clue (7)
24 Increased production and went in to eat (7)
25 Pursue writing and shorten at start of edit (9)
26 Scene of historic confrontation with Capone, nearly in a murderous rage (5)
27 Predict 1A inaccurately (13)
DOWN
 1 Amount for one who may attract attention (3,3,3)
 2 Shred laciest part of panties (7)
 3 Fish and seal (view at sea) (8)
 4 Offspring lives to seek redress (5)
 5 Grocer’s beginning to deal once again with a plum (9)
 6 Enjoys teriyaki containing shellfish (6)
 7 Heavyweight friend with a key (7)
 8 Native Americans, or teenagers reportedly from Brooklyn? (4)
14 Runt, extra-deformed, making a statement to the authorities (3,6)
16 Bigot trashed phone box near England’s capital (9)
17 “Soused period”: it’s “getting high,” for bookish types (8)
19 Strike a pose, aloft in the fog (3,4)
21 Gary’s place is at home with a goddess (7)
22 Woke up in time, occupying a small role (4,2)
23 Grove of trees cut the heat (4)
24 Glasses are requirements for a project (5)
SOLUTION TO PUZZLE NO. 3263

ACROSS 1 SIGN + OR 5 THE + [li]FT[er] 9 anag. 10 P + LOY 12 W(H)ET 13 anag. 15 AT + TILA (rev.) 17 STA(YO)N 20 rev. hidden 23 2 defs.  25 anag. 26 C + AS PER 27 init. letters 28 UTHAN + T (haunt anag.)
DOWN 1 STOW + E 2 [e]GR-E-ET  3 NE(ATL)Y (yen rev.) 4 [g]OATS  5 TR(EAT)Y 6 rev. 7 anag. 8 “Taipei” 11 anag. 14 ROC + O(C)O  16 TH[is] + RASH 17 STEM + S (rev.) 18 hidden 19 S + TART  21 N(OS)Y 22 rev.