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ACROSS

 1 Eccentric uncle entertaining notion that’s like some ancient postulates (9)

 6 Aristocrat’s farm structure containing ox’s head (5)

 9 Worm’s difficult decision: heading backward with two legs missing? (7)

10 Rating a nutty and fruity dessert (7)

11 Obnoxious prig, 9, concealing husband’s first infidelity (12)

14 Defeated and sent on the way (6)

15 Swapping leads in the night, trimmed (cut) prices (4,4)

17 Weapon in the direction of mother bird (8)

19 Entertainer’s spiel for gentle stroker? (6)

21 Historic list of ten or twenty, perhaps, starts after zero (4,2,6)

25 Spell “verile” incorrectly (with an E) (7)

26 Cup of tea set in front of parasites (7)

27 No city in Iowa provides what can be found at the beginning or end of all the other Across entries (5)

28 Auction’s tabletop covering base of the most sickly hue (9)
 

DOWN

 1 Where Rick Perry is coming in late to babble about empty anger (10)

 2 Erroneously count sum in scales (10)

 3 I fall apart over the writer’s bad reputation (3,4)

 4 Stopped keen deductive link (5)

 5 African genii ran amok (8)

 6 Early on, bohemians take in disheveled nonconformist (7)

 7 Feeling regret about incomplete annihilation (4)

 8 Bread, upon reflection, is bread (4)

12 Coach with self-possession holding inappropriate chats (4,6)

13 Mixture of copper and tin’s on the horizon (2,8)

16 Residents spilled reds around hole in the ground (8)

18 That man rises awkwardly as successor (7)

20 With a jittery manner, it’s essential to flag it at once (7)

22 Colt loaded with cartridge, initially from the center (5)

23 Architect’s songbird (4)

24 Thin units of thickness brought up (4)
 

SOLUTION TO PUZZLE NO. 3282
 

ACROSS 1 GAM-E (rev.) 3 anag. 
10 O(EDI)PUS (die anag.) 11 SAW + LOGS 12 anag. 13 I + DING (ID’ing) 14 PS + ALMS 16 S[ki]N + ITCHES 18 anag. 19 rev. hidden 
22 BE-[n]/L-CH 23 LEI + SURELY 
25 CON FUSE 26 POP’S + TAR 
27 anag. 28 G + RID

DOWN 1 GRO(W[oma]N)UP 
2 MAD + AM 4 R + IS + QUE 
5 [d]/V-ISCOUNT 6 pun 7 anag. 
8 EN SIGNS 9 A PART(MENTHO[l]) + USE 15 anag. 17 JOL(LIES)T 
18 CU(BIC)LE (clue anag.) 20 LA(Y)ERED (dealer anag.) 21 rev. 24 [n]EATER