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ACROSS

 1 After the first, stop ensnaring Casanova with groovy tie everywhere (3,4,3,5)

 9 11 pictures, omitting the author (5)

10 Wild animals clear out in Minnesota? (5,4)

11 Debugs problematic 9 (6)

12 Permanent programs can heat up if terminals are interchanged (8)

13 Pains teach essential content (5)

15 Wisdom of Reykjavik, perhaps? (8)

17 Smarter to return vessels to dock (8)

19 Marketplace for… I’m not sure what (5)

21 Spooner’s “male fuels”? You can see right through them (8)

22 Knelt dizzily after a sock (6)

25 Improper warrant involving Simpson’s epic battle (6,3)

26 Hugh’s award (5)

27 Classic film is convoluted, abstruse, unloved (6,9)

DOWN

 1 Skill: hiding my support for a child on base (4,4)

 2 52 ÷ 5? Start of division gets you angry (5)

 3 Running through executive’s personal service (7)

 4 Runs behind a bunch of logs (4)

 5 One in suspense about baseball stat—a sign of things to come (9)

 6 Speaker’s need to uphold staff argument (7)

 7 A dog with a flower is white (9)

 8 Holiday when someone who abstains has one more stroke (6)

14 Oh my—no one disturbed a romantic getaway (9)

15 Reflecting once again, plunges into Du Bois’s network (6,3)

16 Copied one university and took in department head (8)

18 Blasphemous marketing of an initiation to evil (7)

19 Scheme’s conclusion: grabbing $1,000 (7)

20 Heading north, prepared Alaska’s fish (6)

23 A shopping center repelled a beast (5)

24 Angela Merkel, for one, curtailed flimflam (4)

SOLUTION TO PUZZLE NO. 3301
 

ACROSS 1 N(UMBS + K)ULL (bums anag.) 6 BOA(S)T 9 S(CRA)PED (car anag.) 10 MI(XTU)RE (tux anag.) 11 anag. 12 RH(IN)O 13 GU(N[es]T)ER (urge anag.) 15 BROTH + [cyb]ERS[hop] 17 “saw, span” 19 P + RIS ON (rev.) 23 anag. 25 S(T)EVENS + ON 26 O(REGAN)O 27 ME + OWING 28 GAN (rev.) + JA 29 D AND ELI ON 

DOWN 1 N + E(STEG)G (gets rev.) 2 MA + RTIAN (anag.) 3 “soup or seed” 4 UN(D)ONE 5 LA(MASER)Y (smear anag.) 6 2 defs. 7 A BUS I’VE 8 THE BOS (anag.) + [Willi]S 15 T(HREES)OME (here’s anag.) 16 PA’S SWORD 17 anag. 18 UNCLE + A + N 20 anag. 21 NON-AGON 22 hidden 24 T(I)ARA