Theme: I resemble this theme - Three terms for a, shall we say, abundant stomach.
17A. What baguettes may be served in : BREAD BASKET
29A. Fifth wheel : SPARE TIRE
45A. Cozy place to read a book : BAY WINDOW
60A. Emotional response (which might be induced by 17-, 29- and 45-Across?) : GUT REACTION
Argyle here. I like that the three terms are not necessarily a bad thing; who doesn't like a bay window or a basket of bread? Yum! I understand some cars do not carry a spare tire any more. Not a good idea, here in the hinterlands. Oh, and I liked the puzzle, too.
Across:
1. Understand : GET
4. In a chair : SEATED
10. It may be crushed at a bar : ICE. Not to be found in any form at Villa Incognito.
13. Dinghy gear : OARS. A dinghy (or dingey) is a type of small boat.
15. Water-carved gulch : ARROYO. Most of the time dry except after heavy rains.
16. Traitor : RAT
19. Toronto's prov. : ONT. (Ontario)
20. Cover, in a way, as a car : INSURE
21. Baltic Sea republic : ESTONIA
23. "Hannah Montana" star Miley : CYRUS. Not what she looks like now. PIC.
26. Minor argument : TIFF
27. Mimic : APER
33. Bird: Prefix : AVI
34. Mobster's code of honor : OMERTÀ. Haven't seen this entry in a while.
36. Dashing style : ELAN
37. Old sheriff's badge : TIN STAR
39. Self-respect : DIGNITY
41. __-Seltzer : ALKA. Good entry for today's theme.
42. Jeans giant of the '80s : GITANO
44. Grant-giving gp. : NEA. (National Endowment for the Arts)
47. Identifies in a Facebook photo : TAGS
49. Penultimate-round game : SEMI. Before the final.
50. Egyptian life symbols : ANKHs
52. Numbers to crunch : RAW DATA
55. Title Gilbert and Sullivan emperor : MIKADO
59. Pub offering : ALE
63. Mud bath site : SPA
64. Manuscript fixer : EDITOR
65. Just : ONLY
66. __ ejemplo: Spaniard's "for example" : POR
67. Hate : DETEST
68. Cowboy singer Ritter : TEX
Down:
1. Mongolian desert : GOBI
2. Be worthy of : EARN
3. Very, in Vichy : TRÈS
4. Pirate's weapon : SABER
5. Time to remember : ERA
6. Latin art : ARS. The Latin word for art.
7. Casino gratuity : TOKE
8. Cause of blurry vision, perhaps : EYE STRAIN
9. Nashville's West : DOTTIE
10. Speck in a magnetic field experiment : IRON FILING
11. Kid's plea : "CAN I?"
12. Jazzy James : ETTA
14. Alfredo, for one : SAUCE
18. Timber trouble : DRY ROT
22. Frequently : OFTEN
24. Logon requirement : USER ID
25. Mar.-to-Jun. season : SPR. (spring)
27. Walled city of Spain : ÁVILA
28. Kids' digital deal-sealer : PINKY SWEAR. Shaking hands - except with only pinkie fingers.
30. When the cock crows : AT DAWN
31. Rent-a-car charges, e.g. : RATES
32. One-named Irish singer : ENYA. 'Fraid she doesn't fit with my singers today.
33. Run __: drink on credit : A TAB
35. Star brightness measure : MAGNITUDE
38. Cut, as logs : SAWED
40. "Wuthering Heights" genre : GOTHIC
43. One __ customer : TO A
46. Painted a picture of, say : IMAGED
48. Invite as one's date for : ASK TO
51. Target competitor : KMART
52. Coarse talk : RASP. Bit tricky.
53. Brand for a pooch : ALPO
54. Toiling away : AT IT
56. "__ She Sweet" : AIN'T
57. Mete (out) : DOLE
58. Jet-black gem : ONYX
61. GPS suggestion : RTE.
62. Camera named for a goddess : EOS
Argyle