Retrospect

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Across
  1. 4. / Rose variety
  2. 8. / It's created in a snap
  3. 10. / Lawyer's reading
  4. 11. / Muffin ingredient
  5. 12. / Creature apt for this puzzle
  6. 13. / Selling point?
  7. 14. / Leader of the flock
  8. 16. / Satchels
  9. 18. / Boiled dough ball
  10. 20. / part of Roy G. Biv
  11. 21. / ball girl
  12. 25. / Part of a Clue accusation
  13. 27. / Central or Hyde
  14. 28. / The Sage of Concord
  15. 31. / "Shamus"
  16. 32. / Crux
  17. 33. / Like filet mignon
  18. 34. / Pool plaything
  19. 35. / When Solomon Grundy married.
  20. 37. / Cruel one
  21. 39. / Wilson's ___ Points
  22. 41. / Minstrel end man
  23. 42. / "Hollaback ___" (megahit single by 18 Across)
  24. 44. / firefighter's need
  25. 45. / Privateer's spoils
  26. 46. / type of mom
  27. 48. / Victim of Brutus
  28. 49. / Command to Fido
  29. 52. / "Mrs. Doubtfire: You've cross-dressed out of love of your family, so you're..."
Down
  1. 1. / wisher, for one
  2. 2. / Subway heading, perhaps
  3. 3. / Some run to get in it
  4. 5. / Wordsworth work
  5. 6. / You might shout out with it, if you're a reindeer
  6. 7. / Red dye root
  7. 9. / Darkening
  8. 11. / Going's opposite
  9. 15. / Avril Lavigne hit
  10. 16. / "I Dreamed a Dream" singer Susan
  11. 17. / "Cast Away" costar (in a way)
  12. 19. / 'Heavens!'
  13. 22. / Goodies
  14. 23. / imperial
  15. 24. / Like Orbison's woman
  16. 26. / Start of a Shakespearean title
  17. 29. / "No valley low"
  18. 30. / Civil War general
  19. 31. / Green & Yellow
  20. 36. / Chain pitched by Michael Phelps
  21. 37. / Aromatic plant
  22. 38. / Bloom visitor
  23. 40. / Boxer's target
  24. 43. / Invention spawned by a pie tin
  25. 47. / Boom box button
  26. 48. / Long-running Broadway musical
  27. 50. / This puzzle's theme
  28. 51. / Uncle Sam poster word