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ACROSS

 1 See 2 if confused about final two parts of clues (7)

 5 Filthy locale outside university, very loud and poorly ventilated (6)

 8 “Goodbye, trouble!” is heard (5)

 9 Places where animals graze in unadulterated delight (8)

11 Will examine last word at end of fight (9)

12 Benjamin’s half—it alternates with the second half of 5 across (5)

13 and 10 down This hint to four words hidden within this puzzle’s entries was not uttered by a discoverer of DNA, nor by a master decipherer of clues (10,2,4,6)

16 A monster, and therefore repulsed (4)

18 Part of church: section of cheap seats (4)

19 Ocean bird harassed hat wearers (10)

23 Hipster’s comeback: it is implied (5)

24 Creatively recook rap to produce a kind of musical (4,5)

26 Monkeys with computer get a question half-written (8)

27 Times-edited articles (5)

28 and 15 down Prehistoric boast about ravaged zone at onset of epoch (6-3)

29 I agree to equip hothead and heavyweight (5,2)
 

DOWN

 1 Sexist metaphor: he wants “a pert bombshell” (4,3,5)

 2 Ties at first, then victories for baseball team (5)

 3 Erudite fellow getting up to embrace actress Blanchett (8)

 4 Sage’s torn panties (7)

 5 Irrationally respect symbol of authority (7)

 6 Dangerous snafu disrupted beginning of enterprise (6)

 7 Wood cube securing front of fortress in skirmish (9)

10 See 13 across

14 Spooner’s tacky first-born gets a comfy seat (4,5)

15 See 28 across

17 Go back and forth around noon—starting a little late, feeling faint (8)

20 I hear the lady’s outfit is covered with hair (7)

21 Emile Zola, famously: “California brought up dreadful curse” (7)

22 Injury is a feature of rigorous training (6)

25 Former tennis champion is upset (5)

 

SOLUTION TO PUZZLE NO. 3256

 

ACROSS 1 anag. 4 S(MIDGE)N 8 rev. 9 BA[ck] 10 THOR + N 11 OF FENDERS 12 “gallop, pole” 14 hidden 17 MA(K)E 18 ART I CU[r/L]ATE 20 B(L)ACK + L + UNG (rev.) 21 PE(T)ER 23 SP(HERO)ID (dips rev.) 24 E + NAMEL[y] 25 LA(TEN)CY (net rev.) 26 N(OT)YET

DOWN 1 rev. 2 2 defs. 3 MERING(U)E (regimen anag.) 4 SCAF + FOLDING 5 IN + FA(N)T 6 G + UATEMALA (a lame tau rev.) 7 N + UKES 11 OP + PORT + UNITY 13 LIKE + AS + HOT 15 anag. 16 BUM PINTO 19 SKI(RU)N 20 2 defs. 22 hidden