Mega spelling -ist round

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Across
  1. 3. : a comprehensive explanation
  2. 5. : to understand
  3. 10. : a firm decision to do something
  4. 12. : observer
  5. 13. : sorrowfulness
  6. 17. : the final part. of a play
  7. 18. : feature
  8. 19. : eat quickly
Down
  1. 1. : a leading character in a play
  2. 2. : foretell
  3. 4. : Queenly, monarchial
  4. 6. : made of several parts
  5. 7. : a serious disagreement
  6. 8. : a different appearance to fool someone
  7. 9. : important and exciting point
  8. 11. : a section or speech at the end of a book or play
  9. 14. : the ability to do something efficiently
  10. 15. : war like behaviour
  11. 16. : force between like objects