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ACROSS

 1 Graph to once again take advantage of color (10)

 6 Touched fabric (4)

10 Creature you might find in Australia: dead ape (7)

11 Verify argument against a company (7)

12 Tuna salad infested with Rhode Island rodent (6)

13 Where some clergy live, a tabloid is taken in by wrongdoing (8)

14 Actor is angry, flailing about in horse-drawn vehicle (4,5)

16 Bird repressing a cry of pain, namely… (2,3)

18 …a warning from Princess Irene (5)

20 Writing, as I foment trouble! (9)

22 Adventure in Space ruined by commercial exploitation, at first (8)

24 Bricks bother the elite, for the most part (6)

26 Insignificant four (or six) involved in experiment (7)

27 Location in Rome that’s entirely water, we hear (4,3)

28 The Return of the King? Sounds like part of an old movie (4)

29 Comes back to cut short the psychic distress of the post-war generation?
  (10)

DOWN

 1 Loudly sing like Bing Crosby, formerly, with more sodden knitwear (4-4,7)

 2 Cheat as red alert swirls around university (9)

 3 Losing one’s composure, drink a round (7)

 4 Seven minus one is _______! (4)

 5 Church worker’s pouch is light brown, and red inside (9)

 7 Generically keeping name (5)

 8 Recklessly use up tome, absorbed by T.S. Eliot’s stormy quality (15)

 9 Joint action assumed unbroken (6)

15 Look after confused admiral (or animal?) (9)

17 SometWBg helpful for getting clean (9)

19 Sleep on relative’s linen (6)

21 Musician: “FDR lied unconscionably” (7)

23 Following Clinton’s lead, conceal reproach (5)

25 Fancy woman with that guy (4)

SOLUTION TO PUZZLE NO. 3371

ACROSS 1 MEDI(T)ATION 6 2 defs. 10 AV(I)A + TOR 11 F + EARFUL 12 THY + ME 13 A(PART MEN)T 15 [e]GRAS (rev.) + SHOPPER 16 & 17 T AND EM 18 “Appalachian” 21 anag. 23 SO(DA)S 25 HOSANN (anag.) + A 26 rev. hidden 27 R[ed]INK 28 PAR(KING)LOT

DOWN 1 MEA(N)T 2 D + AIRY + FAR + M 3 2 defs. 4 TORN + A DO 5 O(FF)R + AMP 7 hidden 8 anag. 9 BACTER(I)A (bear, cat anag.) 14 GO + D + FATHER 15 SPAR + TANS 16 T(HI + RD)RAIL 19 PRO RAT + A 20 L(OGB)OOK (bog anag.) 22 MA + SON 23 2 defs. 24 SP(L)IT (tips rev.)