Words of manifold meaning

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Across
  1. 2. Half of what nobody ever reads
  2. 3. Confined
  3. 11. Approach?
  4. 12. What a monogamist promises to be
  5. 13. Right
  6. 16. First
  7. 17. Multiple
  8. 18. Standard D6
  9. 19. Ghostly
  10. 22. Baptism?
  11. 28. Almost circular?
  12. 30. Similarity in form, but dually?
  13. 31. Nothing?
  14. 32. Helene feature that was five
  15. 34. Some points in video games, for short
  16. 35. Squarish?
  17. 36. Vanity feature?
  18. 37. One of Buzz Lightyear's destinations
  19. 40. Follow-on from potato
  20. 41. Unreal?
  21. 42. "Retreat!"
  22. 43. Some people prefer this approach, it is said.
Down
  1. 1. "Press forth!"
  2. 4. Lead-in to mechanics
  3. 5. Many beautiful faces
  4. 6. Some solutions
  5. 7. "Shut up and __."
  6. 8. Ordinary
  7. 9. Follow-on from 40 Across
  8. 10. Concern while buying a vat
  9. 14. Something to discuss with one's dom(me)
  10. 15. Always found over a base
  11. 20. Glass half full?
  12. 21. Growing concern in many societies
  13. 23. Extraordinary
  14. 24. Some pickup lines
  15. 25. Aim of a democratic system?
  16. 26. Renaissance paintings?
  17. 27. Follow-on from Aristotelian
  18. 29. Follow-on from Newton
  19. 33. School leader
  20. 38. Glass half empty?
  21. 39. Popular with beavers