Mr Holt's crossword eigh as in eight

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Across
  1. 3. Santa rides in one
  2. 6. an educated guess
  3. 7. everything is OK and secure
  4. 8. 54 divided by 3
  5. 10. not female
  6. 11. not male
  7. 13. measured in kilograms
  8. 18. praise and acknowledge an achievement
  9. 19. beyond earth's atmosphere, moon & stars
  10. 21. work out a solution or complete a deal
Down
  1. 1. show how to do something
  2. 2. cargo carried in trucks and trains
  3. 4. say someone else did it, they take the -----
  4. 5. used for measuring
  5. 9. to complete a period of schooling or university
  6. 12. 10x8
  7. 14. change one language to another
  8. 15. be ready for something about to happen
  9. 16. 4+4
  10. 17. pattern of geometric shapes
  11. 20. remove whiskers