Ad hoc, not ad nauseum

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