Chipmunk-y Business by Fred Piscop

Across 1. Guy's partner 4. Blue-haired Simpson 9. Sci-fi villain __ Vader 14. Regret bitterly 15. Winning, for the moment 16. Kind of acid in protein 17. Prepare for war 18. Did a 440 or a 5K 19. Chophouse selection 20. "The Liberator" of South America 23. Close call 24. "Of course!" 25. Workplace watchdog org. 29. Belgian songsmith Jacques 31. Singer Sheena 33. Moldavia or Azerbaijan, once: Abbr. 36. Hair-care purchases 39. Something tasty 40. The Beaver, formally 44. __ bird special 45. Peau de __ (silk cloth) 46. Language suffix 47. Artful dodger 49. Maneuver carefully 52. Phnom __, Cambodia 53. Blissful state 56. Antipasto morsel 60. "Future Shock" author 63. He was Ben in "Bonanza" 66. Country singer Black 67. Discount rack abbr. 68. Where you live 69. Supporter of the arts? 70. Press into service 71. Capital of Belarus 72. Scatterbrained 73. Club __

Down 1. Hula skirt material 2. Containing gold 3. Auxiliary theorem 4. Eliot's Silas 5. Melville's whaler 6. Pistols, when fired 7. Some Celts 8. Ace Rickenbacker 9. Flash drive filler 10. Food of the gods 11. South American cruise stop 12. Network that's now Spike 13. Weeder's need 21. Regalia item 22. Churchillian gesture 26. Barrel piece 27. Puts an edge on 28. Conductor Previn 30. Freudian topic 32. Hadrian's "Hail!" 33. Tough to climb, perhaps 34. Excise the stubble 35. Aired again 37. Name of 13 popes 38. Fahrenheit or Faraday 41. Seasoned pros 42. Batiking need 43. Pastoral spot 48. Ministerial nickname 50. p, to a pianist 51. Arctic drudge 54. Cut into cubes 55. China's Zhou __ 57. Pelvic bone 58. Chapter's partner 59. Blew it 61. Chive kin 62. Vending machine input 63. Hasty escape 64. Kimono accessory 65. '90s Secretary of Commerce Brown

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