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ACROSS

 1 No- good bums, at first, keep feeding invalid dope (9)

 6 Ark housing small crow (5)

 9 Grazed car, broken into, went too fast (7)

10 Ruined tux, covered with mud and hash (7)

11 They have moved away from streaming illegally (9)

12 Letter from Athens describing fashionable beast (5)

13 Grass destroyed urge to protect nest’s boundaries (6)

14 Doobies, perhaps stock at the center of cybershop (8)

17 Oral proverb: “Reach across for pot” (8)

19 No sir—cop ultimately returned a joint (6)

23 Coat’s tangled up with scarf (5)

25 Scottish author, 77, running around Tay’s source (9)

26 Herb donuts captivate Shakespearean princess (7)

27 The sound of a pet is due to follow me (7)

28 Horse comes back in Germany? Yes: it is evoked in eight Across definitions (5)

29 Head of department and student at Yale using weed (9)

DOWN

 1 Savings account gets returns when invested in nitrogen, for example (4,3)

 2 Alien in Massachusetts train wreck (7)

 3 Take precedence in speaker’s choice between bouillon and grain? (9)

 4 Disturbed one from Quebec and un Américain capturing the heart of Canadians (6)

 5 Scurrilous smear lay outside Buddhist cloister (8)

 6 Senator’s dog (5)

 7 A vehicle I have is potentially dangerous (7)

 8 According to his fans, Bruce Willis finally goes after malfunctioning she-bot (3,4)

15 Weighty book about punk: “Here’s Nirvana, for instance” (9)

16 Father’s weapon provides a means of access (8)

17 Nobel-winning chemist who taught at UC Berkeley snarled, “Go Bears!” (7)

18 Dirty relative with a stain in the rear (7)

20 One way to have fish is Amish stew (7)

21 Geometrical shape devoid of dramatic conflict? (7)

22 Never mind swallowing rats or bugs (6)

24 Where Scarlett O’Hara was clutching one crown (5)

SOLUTION TO PUZZLE NO. 3300
 

ACROSS 1 FL + ATTIRE 5 AMI(C)US 10 EX + PANS + ION 11 hidden 12 “able” 13 anag. 15 SPAC + ETIM + E (rev.) 18 anag. 19 anag. 20 FAS + CIS + TIC (sic rev.) 21 anag. 23 SKI + M 26 hidden 27 anag. 28 NU(DIS)T 29 RE(LEAS)ED

DOWN 1 letter bank 2 APP + LE 3 [s]TANK 4 RU(I)NS 6 MILESDA(VI)S (misleads anag.) 7 CARE + ERIST (anag.) 8 letter bank 9 SNE(AK)ERS 14 anag. 16 anag. 17 INF(RARE)D (find anag.) 22 NIC(H)E 24 K + EATS 25 2 defs.