1: Impose, as a tax

5: Corn cores

9: Math subj.

13: Some intestinal divisions

14: Acapulco attraction

15: Subordinate staffer

16: What happens during a tremor?

18: Tree trunk

19: Include

20: Orchestra that plays light classical music

21: Agendas

23: Commence

25: Cruise ship terminal

26: Study ace?

32: PDA entry

35: Couples

36: She's a deer

37: Courts

38: Merlot cask

39: Observed

40: Item placed on andirons

41: John, Paul, or George, but not Ringo

43: Far from ruddy

44: One who knows the score

48: Hula rotators

49: Deep gulfs

53: Current unit

56: Tree branch

58: Fancy marble

59: Corn-growing regions

60: Imitation diamond

63: Bishop Desmond

64: Fires

65: Arm bone

66: Promontory

67: Merino mamas

68: Paraphernalia

1: Butter beans

2: Say 'c'est,' say

3: South African plain

4: Jabber

5: Abrupt bit of thunder

6: Acorn droppers

7: Tournament exemption

8: More apt to talk back

9: Knight's sleeveless tunic

10: Civil unrest

11: Emulate a couch potato

12: Turns to the right

14: ID item

17: Incite

22: Meadows

24: Goes for

25: Crime scene clues

27: Study of light

28: Zoologist's study

29: Brainwave

30: Caroling song

31: Kind of pool

32: Piercing tools

33: Palinromic ship deck

34: Okefenokee Swamp inhabitant of fiction

39: Nimble

41: Recipe direction

42: Slander

45: Lab monkey

46: Breaks, in a way

47: Reduces in intensity

50: Mink wrap

51: Food from above, biblically

52: Promise

53: FYI cousin

54: Pout

55: Spot and Fido

56: Head hunters?

57: Printing liquids

61: 'Hee ___'

62: Harbor helper