Für Elise

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Across
  1. 2. Medieval forerunner of Chemistry
  2. 6. Site of the prime meridian (9)
  3. 10. A defensive fence of stakes (8)
  4. 11. Political officer in charge of party discipline (4)
  5. 13. 2024: The year of the ___ (Chinese horoscope) (6)
  6. 15. To throw someone out of a window (12)
  7. 17. Being partly or almost (5)
  8. 18. Wrong, Incorrect (9)
  9. 20. Study of time (8)
  10. 21. Landing site of Apollo 11; Sea of ___ (11)
Down
  1. 1. South-East Asian Empire of the 12th Century (8)
  2. 3. Smallest penguin (5)
  3. 4. Colloquial term for decompression sickness (5)
  4. 5. Philosophical conundrum; Ship of ___ (7)
  5. 7. Person dying for a strong belief (6)
  6. 8. Former name of Ho Chi Minh City (6)
  7. 9. Greater region of Hobbiton (5)
  8. 12. between (5)
  9. 14. Armoured dinosaur known for it's bulbous tail (12)
  10. 15. Reach into (5)
  11. 16. Author of the Witcher novels; Andrzej ___ (9)
  12. 19. Amphibious fish; Mud ___ (7)