1: Cause of a bad air day

5: Pas de deux conclusion

9: Place at an angle

13: ___ Cross

14: In the thick of

15: Surrender

16: Ability without difficulty

18: Chips in a chip

19: Welcoming gift on Maui

20: Amount of hair

21: Most prudent

22: Game-show hosts

24: Investigator's assignment

25: Positron, e.g.

31: Large group

34: Battery terminals

35: In need of fuel

36: World War II partnership

37: Bomb that's a bomb

38: Anticipatory feeling

39: Moisten

40: Coins

43: Motion-carrying votes

44: Bumbling ones

47: Hurried

48: Pick of the crop

52: Passed around

55: Crystal sound

57: Prickly casing

58: Kind of union

59: Magnetic mineral

61: Things in a shopping basket

62: Reason and Enlightenment

63: Responsibility

64: Dole (out)

65: Naval post?

66: Swindles

1: Oil source

2: Surfing tool

3: Kind of acid

4: Shortchange

5: Rummy relative

6: Harbinger

7: Tiddlywink, e.g.

8: NPR has none

9: Third-generation Japanese-American

10: You don't need a license to fly it

11: Holiday nights

12: Adam of 'Batman'

15: They are often belted

17: '___ Came You' (1974 Dionne Warwick and Spinners chart-topper)

21: Hard or soft addition

23: Bolts down

24: One responsible for managing clubs

26: 'Really!'

27: Joey's home

28: Satiate

29: Run gracefully

30: Merino mamas

31: Militarist

32: Whom the yoke's on?

33: In ___ (unmoved)

38: Door clasp

40: Powder lovers

41: Responded 'Not guilty'

42: Sincerely zealous

45: Metallic finish

46: Excavates

49: Magazine with an African-American audience

50: Dawn

51: Head lock

52: Not very likely

53: Really dislike

54: Assist larcenously

55: Roman wrap

56: Roman date

59: Flight from justice

60: Dress fancily, with 'out'