6. Set item

10. Major airports, e.g.

14. Spinach-like plant

15. Part of 17A, 66A, 10D & 30D

16. Hip bones

17. Safe & sound

19. Buzzing pest

20. Repair a pump, e.g.

21. Sushi fish

22. In fine fettle

23. Anagram of sit

25. "Oklahoma!" vehicles

27. Small, short-tailed song bird

32. Cattle call

33. Place for needles and thread

34. Part of Indochina

36. Bend

40. Piquancy

41. Gladden

43. Norse mischief-maker

44. Bygone Iranian rulers

46. Zone

47. British blueblood

48. Gel

50. Untidiness

52. Refrain

56. Zilch

57. Angry or sullen look (var.)

58. Criticize, slangily

60. Noggin

65. Language of Pakistan

66. In full swing

68. Poet's A.M.

69. Writer Bagnold

70. Chalmers' business partner

71. Hosiery mishap

72. Scandinavian floor coverings

73. Paris divider

1. 1922 Danish physics Nobelist

2. Spooky sounding lake

3. Joplin music

4. Agree with

5. Muse of comedy

6. Third degree?

7. Astronaut Sally

8. Baddies

9. Taxonomic subdivision

10. Vegas habitue, perhaps

11. Arm bones

12. Popular onion roll

13. Fills

18. Plant with stickers

24. Teatro alla _____

26. Fishy delicacy

27. Hair tamers?

28. Home of the Utes

29. Sushi staple

30. Uptight & jumpy

31. Hidden cache

35. Ben or Gertrude

37. Guy in a sty

38. Creole vegetable

39. Cunning

42. Relaxing

45. Word with horse, lion or dog

49. Not as slovenly

51. Warm welcomes

52. Reunion group

53. Element #5

54. Member of the lowest Hindu caste

55. Fool

59. LaBeouf of "Transformers"

61. Slyly eye

62. Home of heroes?

63. Anagram of nail

64. Celtic lingo

67. Fingers, in a way