1: Insignificant sort

6: Masher's comeuppance, maybe

10: Greeting bearer

14: Pizza cuts, essentially

15: King of the road

16: Kaput

17: Oil source

18: 100-0, e.g.

19: Not on schedule

20: This puzzle's theme

22: Former capital of Italy?

23: Crow's cry

24: Heroism

25: Drained of energy

29: Less outgoing

32: Geometry calculations

33: People use them only when they're full

37: Bustle

38: Celluloid creations

39: Chamber music instrument

40: Showing strong feelings

42: Guardian of underground treasures

43: Formed into a circle

44: Hot dog, essentially

45: Frighten

48: Vehicle at a drive-in movie

49: Root beer alternative

50: Merge

57: Single thing

58: ___-tat

59: Sent a document via phone

60: Tour de France vehicle

61: Hoof-on-pavement sound

62: Ran a rasp across

63: Card pack foursome

64: Gropes for words

65: Pogo said 'He is us'

1: Trampled (on)

2: Whip mark

3: Browser function

4: ___ Gauche

5: Gets through

6: Tiny carnivore

7: Bird with an eerie call

8: Share a border with

9: Flower sites

10: Clavicle

11: Profit

12: 'It's b-a-a-c-k!' fashion

13: Cheerless

21: Wander (about)

24: Chap.'s partner

25: Decision made at home?

26: Jack-in-the-pulpit

27: Colombian coin

28: Fathers' offices

29: Healthy lunch choice

30: WWW programming code

31: 'Sure thing!'

33: Beverage with a bouquet

34: Black, to a bard

35: Stadium topper

36: Person of vision

38: Watch chain

41: Wrath

42: Tallest living quadruped

44: Tongues do it

45: Diver's gear

46: Shaped like a dunce cap

47: Much the same

48: Sounds of thunder

50: Foot part

51: Stag or bull, e.g.

52: Bit to split

53: Cardinal

54: Drive train element

55: Overflow

56: Small whirlpool