Crossword for Smarties

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Across
  1. 3. Swift's ninth album
  2. 6. Ex-Talon operative
  3. 8. Main rings of Saturn amount
  4. 10. Deep shade of red
  5. 12. Type of leather
  6. 14. Widow infatuated with Don Juan
  7. 20. Second word in 凡古山
  8. 22. Favourite of Edward II
  9. 23. A non-algebraic number
  10. 28. Polytetrafluoroethylene
  11. 30. Mathematical spring
  12. 31. Donut licker
  13. 32. Slightly intoxicated
  14. 35. Often made by leprechauns
  15. 38. Tranquil rural scene
  16. 40. Gormenghastian chef
  17. 41. Dainty reptile
  18. 42. Skirt in French
Down
  1. 1. A large group of similar things
  2. 2. A function whose derivative is never zero
  3. 4. Thin membrane
  4. 5. Pinyin of Elephant
  5. 7. Queen of scots
  6. 8. C2H5OH
  7. 9. Multidimensional matrix
  8. 10. Public passenger vehicle
  9. 11. (*) Non-zero smaller than all positives
  10. 13. Young male horse
  11. 15. Greek letter that commonly denotes (*)
  12. 16. Be imminent
  13. 17. Hole in Italian
  14. 18. Hermione is not an...
  15. 19. Unattractive lawyer
  16. 21. Afflict with worry
  17. 24. First US state
  18. 25. Son of Aegeus
  19. 26. Put down
  20. 27. C2H3 group
  21. 29. Constellation
  22. 33. Poem attributed to Homer
  23. 34. Animal associated with Saraswati
  24. 36. Bay of Alcatraz (abbr.)
  25. 37. Iron
  26. 39. Worshipper of cylindrical quaffing cups