Ad hoc, not ad nauseum

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Across
  1. 2. / A beagle that’s just had a litter?
  2. 3. / What a stone-skipper hopes for
  3. 4. / Ricky loves this natural blonde
  4. 6. / Cleo's demise
  5. 8. / A lady who rode bare back in the day
  6. 9. / A tree with edible pods
  7. 10. Horses / Osmonds hit about screwy stallions
  8. 13. / Roger Rabbit was one
  9. 14. / A cow releases 30-50 gallons of this daily
  10. 15. / This dunker’s delight is a crossword cliché
  11. 16. / Aussie band that’s always a current favorite
  12. 18. / The body's strongest muscle (by weight) is located here
  13. 19. / A caffeinated island?
  14. 22. One / How dramas always start
  15. 23. / The sun in Seville
  16. 25. / The thug who probably committed the crime?
  17. 26. / A moon of Jupiter that sounds quite continental
  18. 27. / A type of column
  19. 28. / Spiced ham portmanteau
  20. 30. Dam / A curse by a semiaquatic rodent?
  21. 32. / The Fab Four could use a little!
  22. 33. / Ghana's greatest export
  23. 34. / It's a bird! It's a Canadian coin! It's a...
  24. 36. E / A vowel with laryngitis?
  25. 40. / New York politician who sexted his
  26. 42. / Mild swear with a twang
  27. 43. / A sign of fire on the first day of winter
  28. 44. / Wall-hanger that’s a noun and a verb
  29. 45. Hogthrob / Porcine captain on The Muppets Show
Down
  1. 1. / Alice Walker never suffered this fear
  2. 5. Overcoat / A spy's parka?
  3. 7. / A tomb that makes a point
  4. 9. / A flaming cure for what bugs you
  5. 11. / Often called the best screenplay ever written
  6. 12. / This Chevy model was a no-go in Mexico
  7. 17. Crusader / Batman’s alliterative alias
  8. 20. / Leonardo drew this man in phases
  9. 21. / Hip swiveling sobriquet “Elvis the ______”
  10. 24. / A motherless calf
  11. 29. / Fred’s baby daughter
  12. 30. / A Yiddish hill of beans
  13. 31. / Sri Lanka’s erstwhile moniker
  14. 35. / Slogan of a Brooklynite amnesiac?
  15. 37. Petrie / Before MTM was Mary Richards, she was her
  16. 38. Cobra / Dubya's nickname for NYT columnist Maureen Dowd
  17. 39. / Jacob's right hand
  18. 41. / An element so radioactive, it glows in the dark