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ACROSS

 1 Solo sound of bell, leading to passion for working together (4,2,5)

 7 and 28 Unions & co. fail miserably (3-3)

 9 I ran my convertible around back of Earl Monroe (7)

10 Idea 15: mixed drink (4,3)

11 Disgusting earthborn alien (9)

12 Pastor Chris is filled with light (5)

13 Where the Aggies play cello badly, and pregnancy follows (7,7)

18 Avoiding the stock exchange, Umberto interrupts apparent stalker (4-3-7)

22 Type of pint drunk outside university (5)

24 Stood and tattled about Ecstasy and speed (9)

26 Shout: “This is not seen below” (7)

27 Chilean statesman to advance, immersed in brew (7)

28 See 7 across

29 Holy man with a moral stance: manage doctor’s device (11)

DOWN

 1 In Milan, my honey read over a songbook (6)

 2 Filthy hotel porn: it can be magnetic (5,4)

 3 Uncapped brand of beer is more praiseworthy for some (5)

 4 Liquor’s English root (7)

 5 Prolific writer taking detective’s drugs (7)

 6 Disrupt serenity with a weariness of vision (9)

 7 Up first, letters from American Spectator that I read (5)

 8 Look over an object with hatred (8)

14 Ranges of faceless clichés (9)

15 Kernel of sweet corn, and more along the same lines (3)

16 One adjacent nose, broken at great length (2,7)

17 Concerning the totality of, like, Swiss cheese? (8)

19 Spay dog or cat—after trimming, she could be a source of inspiration (7)

20 Also, hen running with restricted movement (2,5)

21 Stick notice in this place (6)

23 God switched last two parts of a hybrid fruit (5)

25 Baked goods in a car (5)

SOLUTION TO PUZZLE NO. 3337
 

ACROSS 1 CLAR(IN)ET 9 ACTO (anag.) + R 10 2 defs. 11 rev. hidden 12 J + ARGON 14 anag. 17 T + HEFT 19 anag. 21 anag. 23 pun 24 O + SCULATE (anag.) 28 O(OLE)R 29 DR + I’VE 30 anag.

DOWN 1 BAT ON (rev.) 2 ST + RETCH 3 pra[n]ce anag. (&lit.) 4 [h]-ANK-H 5 hidden 6 EV(ER)GREEN (revenge anag.) 7 WAR + MS + POT 8 S + KIN 13 & 16 WELL + NESS 15 anag. 18 hidden 20 G(ONE)OUT 22 OPUS(DE)I (Ed rev., pious anag.) 23 D + ICE 25 rev. 26 AM-ISH 27 “flee”