Minor crossword - Fur Elise

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Across
  1. 1. Opening in a forest (5)
  2. 4. Single unit capable of forming chains with itself (7)
  3. 5. Vexillum; symbol of a nation (4)
  4. 7. A mythological spirit of nature (5)
  5. 8. Offense of being disobedient in court: Held in ___ (8)
  6. 12. Property of a substance to deteriorate other materials (9)
  7. 13. Natural and strong smell (4)
  8. 17. Raise the level of; Improve (6)
  9. 20. Directed or moving backwards (10)
  10. 22. Somewhat inactive lifestyle (9)
  11. 23. Horse drawn vehicles (6)
  12. 28. Greek god who is responsible for the sun's movement across the sky (6)
  13. 29. Kingdom of Vietnam in the 4th-13th Century (6)
  14. 30. Health (8)
  15. 31. Supernatural being (Arabian) (4)
  16. 32. Something that is based off another source (11)
  17. 33. Habitat (9)
Down
  1. 2. Organisms capable of living at extreme conditions (13)
  2. 3. Mourning; expressing deep grief (9)
  3. 6. Endonym of New Zealand (8)
  4. 9. An excessive amount (8)
  5. 10. Instrument of the reaper (6)
  6. 11. National park containing the Dawnwall (8)
  7. 14. Sudden (11)
  8. 15. People ordained for religious duties (6)
  9. 16. Great enthusiasm or energy (4)
  10. 18. Particles without charge, or belonging to a group with common goals or interests (9)
  11. 19. Large aquatic arthropods (10)
  12. 21. In a state of disrepair (11)
  13. 24. Strategy in Chess that usually requires a sacrifice in exchange for an in-game advantage (6)
  14. 25. English tradition: Signal of death using a bell (4)
  15. 26. A soft gentle breeze
  16. 27. A structure that has become functionless in the course of evolution (9)