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ACROSS

 1 For example, maroon a chauffeur taking semifinal in econ course (8,5)

 9 Decimal, frequently (5)

10 Carol catches one of the Dionnes, possibly, looking askance (9)

11 Kennedy, formerly lazy and fierce (8)

12 Flowing garment behind street light which is flashing (6)

14 Shoot Spanish truck (5)

16 Temporary beachfront room captures the times (5-4)

17 See, I buy things covered with adobe for the most part (9)

19 Spirit seen in New York unit (5)

22 Assistant’s responsibility: concealing record (6)

23 Editor for Paul Robeson, perhaps? (8)

26 Ice-cold (or put another way, reptilian) creature (9)

27 Friend’s question about self-identification with a game (5)

28 Mountaineer is a supremely good-looking person with an exciting quality—and not attracted to members of the same sex (7,6)

DOWN

 1 Snacks made by Tom Joad’s fellow migrants? (7)

 2 “Not so big—about a quart” encapsulates the essence of bottling (7)

 3 Descartes originally wanted to extend a subscription (5)

 4 Revelation of price reduction (50 percent off): over 50 euros wasted (10)

 5 Crush tire in ditch (4)

 6 Invent gut-wrenching game for a French casino (5-2-2)

 7 Subterranean part of a plant to grow with mantra chanted aloud (7)

 8 Shiny silver distracted male (6)

13 Breakfast obtained by unethical means? (7,3)

15 Army troop’s leader wears a dress in Casper, Wyoming, maybe? (5,4)

17 The first family’s dog bones found in part of a woman’s garment (6)

18 Maintain: “It is kind to take in an injured pup” (7)

20 Having sex around a bit of tacky protective material (7)

21 Concord, NH, mayor is corrupt (7)

24 Memorable battle with ice cream after putting away two pieces of dessert (5)

25 Spouse cut off the first way to get online (4)

SOLUTION TO PUZZLE NO. 3344

ACROSS 1 ALP + HABETIZATION (habitat zone I anag.) 9 RE(GUL)AR (lug rev.) 10 A + S(PH)ALT 11 C + ONE 12 OPTI(MIST + I)C 15 DIP + LOMATS (anag.) 18 anag. 19 B + LIMP 20 anag. 21 AT TEN + DANTS (anag.) 23 init. letters 26 [f]ISH + MAE + L 27 I’M PAST O 28 ESPRES(SOMA)CHINE (Amos rev., his presence anag.)

DOWN 1 A BRA(CAD)A BRA 2 PAG + AN (rev.) 3 A CLU[e] 4 anag. 5 IRA + QI 6 APP + O + IN + TING[e] 7 INA(STUP + O)R (rev.) 8 & 26 NOT ICE 13 COB + BLEST ONE 14 COMPE(NSA)TE 16 PR(INTSH)OP (hints anag.) 17 anag. 22 ATLAS[t] 24 MAS (rev.) + AI 25 2 x hidden