1: Yellow weed

6: 'Them' insects

10: Inscribe with acid

14: Ease off

15: Like one end of a pool

16: Well-ventilated

17: Schoolgoer

18: Words with precedent

19: Go postal

20: Stiffens

22: Unproductive

23: Copy editor's bane

24: Absorb, with 'up'

25: Shoe inserts

27: Incidentally, in Netspeak

30: Merchandise

32: Eric Clapton solos

36: Electrify

37: Lingerie buys

38: Preceder of box or light, in slang

39: Most economical

41: Where a plane's engine is housed

43: Knock down

44: Break-taker's number

45: Garbage bag closer

46: Incredible bargain

47: Appraiser

48: Bricklayer's item

49: Varieties

51: Word before sheet or session

53: Adult ugly duckling

56: Choose

57: Impresses, as on the mind

61: Pat response

62: Part of a hammer head

64: La Scala offering

65: Roman date

66: Plate of glass

67: Lose one's cool

68: Kittens' cries

69: Besides

70: Counterfeit coins

1: Tune for lights out

2: Share a border with

3: Back of the neck

4: Filthy abodes

5: Coward

6: NPR has none

7: Teases

8: Colorful aquarium fish

9: Prevents litters

10: Upper or Lower, in New York

11: Elfin

12: Renege, slangily, with 'out'

13: Shot in the arm

21: Practices punching

26: Three-horned dinosaur

27: They lead to walks

28: What a little bird told me

29: Interlace

31: Wharf pest

33: Disgusting dirt

34: Leaf in a book

35: Spirited horse

40: It counts

41: Louse egg

42: Declares

44: Fixes securely

47: Take off the books

50: Old man, to a kid

52: Of the Holy See

53: Not very likely

54: Off the mark

55: Freshly

58: Maître d's offering

59: Fuddy-duddy

60: Cul-de-___ (dead end roads)

63: Opposite of paleo-