1: Hot tubs

5: Ho-hum

9: Cow stomach

14: Hide in the shadows

15: Whip mark

16: Bring forth

17: Rubbed the wrong way

19: Buggy playgrounds?

20: Less messy

21: Pyramids, prisms, et al.

22: Pivotal

23: Way off

26: Miami cagers

27: Relieves

29: 'Shogun' sash

32: GPA part

35: Lewis Carroll's 'Jabberwocky' word for 'scratch, dog-style'

36: KO caller

37: Self-reproach

39: Alone, when preceded by 'by'

42: Mont Blanc, for one

43: Stag

45: Devout

46: Stain, as a fabric

47: Free from pathogens

49: Castle in a board game

51: Sit before a lens

52: Maw's partner

55: Save from a flood, say

57: Feel a strong desire

59: Indian nursemaids

60: Heavenly

63: Music category

64: Deli loaves

65: Fail to include

66: Mixed in

67: Senate votes

68: Bosom buddies

1: Go furtively

2: Dish made using a blender, often

3: Duds

4: Revue segment

5: Is much larger than

6: Wharf pest

7: Tap output

8: Four-poster, e.g.

9: Changes the decor of

10: Soft palate part

11: Kept an eye on

12: Scratched (out)

13: Promontory

18: Ad with a freebie

21: Metallic quality

24: ___ stables

25: Piano man Charles

27: Time-wasting bother

28: Cavern

30: Telephony pioneer

31: Uncertain

32: Diploma holder

33: Trust, with 'on'

34: Connecting symbol

38: Get rid of

40: White herons

41: Szechuan sauce source

44: Lambaste

47: Pie-eyed

48: Take stock of

50: Earth tone

52: 'Jump, Jive, an' Wail' composer/bandleader Louis

53: Profit

54: Whip marks

55: Indian music

56: Possessing peepers

58: Capping

60: Blubber

61: Spot

62: Grassland