1: Get going

6: Simple organism

11: Streaking, once

14: Fielder's faux pas

15: Behavioral bases

16: Very cold

17: Carpenters visit them

19: 'You ___ here'

20: Whimsical

21: Lose feathers

22: Any acetate, chemically

24: Dot follower

25: Goose sound

27: SWAT team specialists

33: Nickels and dimes

34: Roller coaster feature

35: Places

37: Golden Rule preposition

38: Office aides

39: Quaint oath

40: Las Vegas rollers

41: Tape spool

42: Edible rhubarb parts

43: Professionals who might get your back up?

46: Bread pieces, to fondue

47: Ossuary

48: Orzo or ziti

51: Marginally sufficient

53: Printer spec.

56: Spot

57: Prohibition-era fixtures

61: Hardly hard-nosed

62: The things there

63: Aesop's lesson

64: 'Friendly' pronoun

65: Submerges

66: Inscribed pillar

1: Starter starter?

2: Test choice

3: Word before ant or brat

4: Hold up

5: Earth movers?

6: ___ nitrate

7: Protective trench

8: Goof up

9: Four-poster, e.g.

10: Nod of the head, for one

11: That's an order

12: Piece of property

13: Batik worker

18: Play like a puppy

23: Bare bones model?

24: Paddling advocate

25: Hullabaloo

26: 'Clumsy me!'

27: Kind of boom

28: Sudden snag

29: Is in the arms of Morpheus

30: Greek hymnist

31: Four-minute mile breaker Bannister

32: Flimflams

33: Bossy's chew

36: Passports, e.g (abbr.)

38: De ___ (too much)

42: Anglers' locales

44: Friars Club events

45: Make healthy again

48: Hit with hailstones

49: Indian maid

50: Seductive

51: 'Phantom...' prop

52: Barely manages, with 'out'

53: Like some straits

54: Sound of laughter

55: Sea spot

58: Upsilon follower

59: Many, many moons

60: Barfly