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Across
  1. 5. - Weeping tree (six)
  2. 7. - Percussion instrument (nine)
  3. 8. - Sound reflection (four)
  4. 11. - Star system (six)
  5. 13. - Desert plant (six)
  6. 16. - Perfect society (six)
  7. 17. - Flower arrangement (seven)
  8. 18. - Puzzling question (six)
  9. 20. - Narrow sea inlet (five)
Down
  1. 1. - Highest point (six)
  2. 2. - Writing feather (five)
  3. 3. - Medieval chemistry (seven)
  4. 4. - Arctic plain (six)
  5. 6. - Exotic flower (six)
  6. 9. - Sea robber (six)
  7. 10. - Sheltered port (six)
  8. 12. - Secure room (five)
  9. 14. - Peak meeting (six)
  10. 15. - Himalayan bovid (three)
  11. 19. - Small knife (six)