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ACROSS

 1 Different tactic ultimately executed (7)

 5 Holiday tradition—for example, turning instrument over (6)

 8 Broken-down car belonging to no traffic cop? (5)

 9 Relating distorted figure from 3 (8)

11 Mail recipient reads letters, often more than once (9)

12 Retired TV host has internalized “Start to talk slowly” (5)

13 Major highway buries museum in London (10)

16 Oddly, put aside shell shock (4)

18 Car seat contents! (4)

19 Some celebrities refuse to be bound by independent label in comeback (10)

23 Former Washington newspaper docked former baseball team (5)

24 Heavens! Conclusion of Hamlet involves play on words that is most courageous (9)

26 Ornamental decoration resembling a white powder? (8)

27 Buffalo Bill dropping lines with a boy (5)

28 Like a weight lifter, Roosevelt breaks into song (6)

29 Legal authentication is spread to include plunder (7)

DOWN

 1 Polluted and foul 10 (12)

 2 Ran two by two, with a late start (5)

 3 After removing nitrogen from biological blueprint, try some math (8)

 4 Organized information with prosecutor to shock court at last (4,3)

 5 Famous rapper’s abridged New Testament (7)

 6 Awkward mob at large gym (6)

 7 Love beginning to overcome desire before giving a new order to eat and drink (6,3)

10 Do not enter 1D under the influence (2,10)

14 Aviator’s toilets malfunctioned when clogged with toilet paper (4,5)

15 Environmentalist harbors draft resister (3)

17 Hold up a book, mostly for baby’s entertainment (8)

20 Tilting component of a directory (7)

21 Minor improvement that hurts parts placed the wrong way round (5-2)

22 Phony post office pockets a raise in what members pay (6)

25 Overseas yachtsman assuming course with predictable outcome (4,1)

SOLUTION TO PUZZLE NO. 3485

ACROSS 1 DIE + OF + F 4 BASS + D + RUM 10 CENT + RA-(LAMER)-I CAN 11 RE BUSES 12 D + RAGOUT 13 NEE + R + DOWEL + L 15 anag. 18 rev. 20 LAB ORATORY 23 SKIM + ASK 24 rev. hidden 25 “the right” + OF[f]SPRING 26 POST + “lewd” 27 AR(G)YLE (early anag.)

DOWN 1 DOC(T)RINAL (ironclad anag.) 2 anag. 3 F + I RESIDE 5 ARM + A DILL + O 6 anag. 7 RAC + CO + ON (rev.) 8 M(ON)ET 9 hidden 14 “week need” 16 IV + Y[a]LE + AGUE 17 BAG (rev.) + PI + PER 19 ICI + NESS 21 OBE(SIT)Y 22 FA + CIAL (rev.) 23 S(ET)UP (UPS anag.) 24 SI (rev.) + FT.