Nigel's Crappy Crosswords #2 (no pun intended)

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Across
  1. 4. A witty remark is also known as a?
  2. 6. When love goes unmet.
  3. 8. Largest of the Earth's many satellites.
  4. 9. Comes after the main act.
  5. 11. Not for and not against.
  6. 13. Another term for forfeit.
  7. 14. The theory that life on Earth was seeded by meteors/comets.
  8. 15. Another word for boobies.
  9. 16. The most prevalent language before english took hold.
  10. 18. Without due cause.
Down
  1. 1. Someone who has mastered their craft is an?
  2. 2. The act of something dispersing.
  3. 3. Synonymous with 'often'.
  4. 5. Comes before the main act.
  5. 7. The most energy-efficient shape found in nature.
  6. 8. The act of chewing.
  7. 10. Speaking.
  8. 12. Evolved from primates and most definitely was not 'created'.
  9. 17. A form of humour famous for it's oxymoronic nature.
  10. 19. How many planets are there?