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ACROSS

 1 Bark interrupting 10 and sunburst? (5,5)

 6 See 18 across

10 In retrospect, attack pitches (5)

11 10 children finally riding hybrid in kind of highway (9)

12 Ultra-radical 10 immersed in subversive texts (9)

13 10 visors (5)

14 Something like this—painfully mashed (2,4)

15 Trips, as units go berserk (7)

18 and 6 Supporter and 10 flourish (7)

19 Poem: “It’s Sean/Redrawn” (7)

21 British pilots almost took to the air, drawing… (6)

24 …rock and roll 10 (5)

26 In between gold and aluminum, flip wig first (9)

27 The poles on either side of 10 instruments (9)

28 Traditional knowledge encompasses one French river (5)

29 Bird is 10 (4)

30 Meeting 10, sprint cart recklessly (10)  

DOWN

 1 Ridiculous, with no pennies in your ears? (9)

 2 Ranges of 10 dissonant duets (9)

 3 Lists of chickens with one egg instead of two (7)

 4 Exhausted source of primal urges? That’s clear (6)

 5 10 appearing in Mother, perhaps (8)

 7 Use molten rock, flowing upward around island’s tip (5)

 8 For example, 4 and 6 and 7 (shifting top to bottom) (5)

 9 Gallows is large raised stake (6)

16 Former queen in Norwegian capital: free, footloose and 10 (9)

17 Hardest tiles, broken up and reassembled repeatedly (9)

18 After 10, Pinocchio at times is well-known (8)

20 They used to make home deliveries of iodine and glue, for the most part (6)

22 I glance diabolically, sporting a halo (7)

23 Largely cultivating dried fruit (6)

24 Full of stewed dates (5)

25 Mountain nymph with nothing to peruse (5)  

SOLUTION TO PUZZLE NO. 3291  

ACROSS 1 WIN + SLOW + HOMER  9 palindrome 10 anag. 11 “prefix”  12 AS + IAN 13 LEVI(TATE)S  16 VI + PS 18 rev. hidden 19 LATE + RALLY 21 C + ROSS 22 K(ICK + ED)IN 25 EM(PATH)ETIC (cite me rev.) 26 N + AIL 27 EX-PLO + RATIONS 

DOWN 2 [p]-INTER-P + LAY  3 “sue” 4 OK + A + PI 5 anag. 6 MER + GANS-ER (rev.) 7 anag. 8 S + CAN 14 anag. 15 TAL(K)S SHOP (slap shot anag.) 17 anag. 20 TAKE T(W)O 21 2 defs. 23 initial letters  24 “on we”