Across

1. Cleaver or Carter

5. Puzzle helpers

10. May- or tad- follower

14. Second largest city in Algeria

15. Olig- or hier- follower

16. Eurasia mountain range

17. Continental song contest

19. Two-wheeler

20. Ceiling-windowed

21. Crunchy green vegetable

23. Hebrew month, Nisan

25. Institutional theft

26. Patchy fur disease

29. Nibble on a hash brownie

33. πr²

34. ___ said than done

35. Putin's former org.

38. Flower

41. 1960s chess champion Mikhail

42. Crunchy green vegetable

43. Smell

44. Smile prompt

45. Online currency ('96-'09)

46. Clay mineral rock

49. Dance flourishes

51. Remembrance

55. -odeon or -cadmium

59. Pub pints

60. Wonderful director

62. Opposite over hypotenuse

63. Talent

64. Refuge

65. Brick boxes

66. Hitched

67. Former parts of a union

Down

1. Namath and Cocker

2. Babylonian city

3. Ne'er (a)

4. Atomic bomber

5. West Hispaniola

6. Its work starts Apr 15

7. US central crime DB

8. Olde second-person singular

9. Bring up-to-date

10. NIH search engine

11. African antelope

12. 57-Down and others

13. Online warning?

18. Cool or harsh emission

22. Enterprise Lieutenant

24. Ringo or George

26. Milkshake addition

27. Opera solo

28. Carter or Gwyn

30. Fire result

31. Some skirts and wedding cakes

32. Large homogenous group

34. Online surcharge?

35. Laredo, TX TV station callsign

36. Rocky subj.

37. Antarctic admiral

39. Pale rusty yellow

40. Axis for exponential data

44. Shuts

45. Grandiose

46. Hulk ___!

47. -trope or -pause

48. Update

50. Tatted

52. Unsure

53. Captain Kang____

54. Songbird

56. Spacey alien

57. Niagara source

58. Metallica drummer

61. Apocalyptic belief (abbr)