1: Grates upon

6: Door clasp

10: Mischief-makers

14: Razzle-dazzle

15: Cornerstone datum

16: Pout

17: Cabinet members?

18: Gondolier gear

19: Happy cat's sound

20: This puzzle's theme

22: Coral habitat

23: Small amount

24: Dissertations

26: Hip sunglasses

30: Big balls

32: Used a bombsight

33: White Stripes, for one

34: Teen hang-outs

38: In bad humor

39: Band blaster

40: Down-to-earth

41: Rock garden creeper

43: Fifth calendar page

44: 'The Sweetheart of ___ Chi'

45: Boxers' wraps

47: Overly ornamented

48: Con game, e.g.

51: Metro maker

52: Comparison word

53: Street urchin

60: Miles per hour, e.g.

61: Piercing tools

62: Dance movement

63: Takes advantage of

64: Test choice

65: Keeps secret

66: GI's diner

67: Spots

68: Edible rhubarb parts

1: Shipping dept. stamp

2: Feel compassion

3: Cat's eye, sometimes

4: Plate of glass

5: Got going

6: Promoted to excess

7: Many millennia

8: Shaker contents

9: Magic word

10: Stager

11: Petulant expressions

12: Dish made using a blender, often

13: Feudal laborers

21: Brake neighbor

25: 'I wonder...'

26: Slumps

27: 'Spenser: For ___' (Urich series)

28: In the thick of

29: Reserved quality

30: Wild cats

31: Adjective for some vines

33: Title for Edith Evans

35: Table supports

36: Hightails it

37: Delight, as a comedy club crowd

42: May celebrant

44: Stagnant swamps

46: Chide

47: Not masc.

48: Hit strings

49: Go after

50: Detests

51: Argon and krypton, for two

54: Off course

55: Sandpaper component

56: Act the butterfly

57: Bona ___

58: Footnote word

59: Promontory