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ACROSS

 1 Lose weight ahead of surprisingly sturdy business opportunity (6,8)

10 “Flipper Returns”: story is comparatively cool (7)

11 Terrible boredom in the boudoir (7)

12 Confused nineties scientist (8)

13 Letters from Doug, Rob and Josh (6)

15 After failed raid, incomplete lines coming from the center (5)

16 Uses a hook to keep time for musical notes (9)

19 Summer employee changes gear fluid (9)

21 Confederate soldier: American puzzle (5)

23 Type of hit! (6)

25 Advertise a lightweight on the radio (8)

27 Symbol of St. Louis, surrounded by some chaos (7)

28 FRANKEN CLAPS, GOES CRAZY? (3,4)

29 Heralds providing necessary contributions for dry run (5,9)

DOWN

 2 Having good taste is penalized again? (7)

 3 Signaling young game? (9)

 4 That woman’s in Germany with taxi containing red crustacean (6,4)

 5 Points raising fashionable nonsense (4)

 6 Florence leaves fish below (5)

 7 Butler gets nothing after treatment for pains (7)

 8 Nation’s desire to imprison me (5)

 9 Triangle reconfiguration is a key concept in calculus (8)

14 Grand, ancient head of government took in a California landmark (6,4)

17 Commuter to complain about bathroom on the way back (9)

18 Doctor Seuss to grab a writing implement? That makes you nervous (8)

20 Piece of music with peanuts and crackerjack? (7)

22 BA gives you something to put around your neck (7)

23 Small, tough fragment (5)

24 Adds a substance to something needed to bring back house calls (5)

26 Child heard flying toy’s return (4)

SOLUTION TO PUZZLE NO. 3404

ACROSS 1 DI (SIN + TEG (rev.) + RAT)E 9 initial letters 10 TRA(DITIO)N (rant anag., idiot anag.) 11 DOLP (rev.) + HI + N 12 INFER + NO 13 LATER + ALLY 15 M’I + NOS (rev.) 16 NA (rev.) + STY 18 F + IVES + ID’ED 20 ST + RIDES 22 anag. 24 OVERJO(YE)D (OJ drove anag.) 25 MAJ (rev.) + O + R 26 INTER + MINABLE

DOWN 1 anag. 2 SU(BP)LOTS (louts anag.) 3 anag. 4 hidden 5 anag. 6 T + HIE + F 7 GI + BRAN 8 anag. 13 LONGS + HOT 14 anag. 15 “mussel-man” 17 2 defs. 19 D(ESKJO)B (jokes anag.) 21 D(I)J + ON 22 M(ODE)M 23 A + ERIE