How often do you eat breakfast?

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Across
  1. 9. You do this sport in a pool.
  2. 10. These can bite.
  3. 11. There are only so many in a day.
  4. 12. Have a meal.
  5. 13. Clap, clap
  6. 15. Repeatedly
  7. 17. One
  8. 18. The most important meal of the day.
  9. 20. In what manner or way?
Down
  1. 1. Do this to your teeth or hair.
  2. 2. Two
  3. 3. Octet
  4. 4. Free from dirt.
  5. 5. Half of ten.
  6. 6. The one reading this clue.
  7. 7. To make clean
  8. 8. Sip from a glass.
  9. 14. Rest quietly after a long day.
  10. 16. Quartet
  11. 19. Thrice