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ACROSS

 1 In Spain, hand a letter to a Greek and use a grand residence (5,5)

 6 Melt what? That’s not acceptable (4)

 9 Nothing is short and thick (5)

10 Signal heard in Illinois city—and “heard” in this clue (9)

12 Either could appear instead of F as a kind of degree stopper (4)

13 Part of a watch is not new (10)

15 I criticize a terrible city in Asia (9)

17 Bald school administrator embezzling $1,000 in setback (5)

19 Regressive attempt to discredit a vegetable (5)

21 Pest from army’s flanks in ravaged, war-torn surroundings (6,3)

23 Composer-playwright is distressingly wan-colored (4,6)

25 State grotto 17 (4)

27 Plunge 17 in low-fat guacamole, maybe? (6-3)

28 Listen to reddish French river (5)

29 Rewind part of movie for a sidelong look (4)

30 Broadcast Farm Aid for a drug dealer? (10)

DOWN

 1 Pole going around Russian city? That’s someone just looking to get hurt (9)

 2 Embarrassingly “naturel,” like the Swiss (7)

 3 Spoken version of appropriate ceremony (4)

 4 Discover French city held in reserve (2,3)

 5 Archetypally, fries and dies? (4,5)

 7 Something you might see in the front hall or hear on a sitcom? (7)

 8 Brief message about the origin of life in the universe (5)

11 Virtuosic musical displays and wild dances, circling the borders of Zambia (8)

14 Yankee airmen flying outside California (8)

16 Like an old TV, with tag and half of that capacity (9)

18 Barman’s cleanser? (9)

20 “Straight shot”—could you use it in a sentence, or give the language of origin please? (7)

22 Renaissance instrument in Baroque air? Italians will eat it up (7)

23 Nosy, like the rapper behind Illmatic? (5)

24 Vaquero, perhaps, at heart! (5)

26 Exist on a field (4)

SOLUTION TO PUZZLE NO. 3329
 

1 GEN(E)-(E)RIC 5 A BRIDGE 9 rev. 10 anag. 11 F + LAWLESS 12 2 defs. 14 EX-IT 15 D IS LOCATED 18 S(PEL[t])UNKING 19 BAN + G 22 EN(JO)IN (rev.) 24 ASS-ESSES 26 S(P + RINK)LED 27 hidden 28 NORI + EGA (rev.) 29 DIG IT AL[l]

DOWN 1 G(I + R)AFFE 2 anag. 3 “[t]riple” 4 CHOPS + TICKS 5 AS + P.S. 6 anag. 7 rev. 8 EN(SURE)D (ruse anag.) 13 B(L)INDS + ID’ED 16 T(RANSI)ENT (rains anag.) 17 AU + DIE + [o]NCE 18 STEPS ON 20 GA(SOHO)L 21 P + E.G. + L + E.G. (&lit.) 23 init. letters 25 hidden