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ACROSS

 1 A pretty rad comic playing the blues? (10,5)

 9 Wrongful ruler from America bombed Peru before onset of revolution (7)

10 Stamp—one in perfect condition—involves hype (7)

11 Thrust 19 épées on the left (5)

12 Rethink 3+10 with a computer communication system (8)

14 What you might play in a pub: a backward violin (5)

15 Someone who handles money for the Rev. Spooner, a clergyman, in springtime (9)

17 Flowing tears concealing certain values (9)

19 J.P. is missing front of medical instrument (5)

21 Ill-made hat mauls part of the brain (8)

24 Polish and French for the capital of Russia (5)

26 Swallowing piece of dirt, bemoan upset stomach (7)

27 Terrible GNP pain is out (7)

28 Drink a generic product around school with hesitation (6,9)

DOWN

 1 Four people getting together to describe Ike’s monogram? (6,4)

 2 Sad one is more disturbed about vessel (7)

 3 Young crowds of trees (9)

 4 Match a resident of Athens incompletely (5)

 5 Author Murdoch and that man—indeed, they are sometimes smiling (5,4)

 6 Bit of paint on impressionist’s sheet (5)

 7 25 found in dilapidated minaret (7)

 8 Origins of yarn: “Everest’s terrifying iceman!” (4)

13 Russian opera reportedly runs with blood online? (6,4)

15 North of European country, pornography becomes hollow, burning desire? (9)

16 Oh, a crappy alternative for Judith, Susanna, etc. (9)

18 Chained savage anteater (7)

20 Lose sight of sailor with the Swedish Nightingale (2,5)

22 Disabled Israeli’s letter (5)

23 Wickedness, from the time of Christ until now (5)

25 Boast about clothing (4)

SOLUTION TO PUZZLE NO. 3320
 

ACROSS 1 SPEEDO + FLIGHT 9 PRO(VIDI)NG 10 anag. 11 RUM + OR 12 TESTA(MEN)T (state anag.) 13 [p]EONS 14 anag. 18 THREA(TENE)D (teen anag.) 20 VET + O 23 pun 25 UM + BRA 26 anag. 27 anag. 28 EASTER + NSA + MOA

DOWN 2 P(LOW + M)AN 3 anag. 4 hidden 5 LEG IS LATE 6 G(AMMA[n])RAY 7 T(ANGEL)O 8 hidden 9 anag. 15 STEVE + DO + RE 16 ST(OR)AGE 17 PA’S(T)IMES (semi rev.) 19 REIS (anag.) + SUE 21 EM BARG (rev.) + O 22 C(UP)OLA 23 rev. 24 SAT + AN