Jolly festive crossword

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Across
  1. 3. Good king?
  2. 5. Salty tree ornament
  3. 6. What was given on the 11th day of Christmas? (noun)
  4. 7. Dung on a stick?
  5. 8. Christmas flower
  6. 10. Grinch's best friend
  7. 11. KFC sales boom on Christmas here
  8. 14. One of Iceland's 13 Santas
  9. 17. First song played in space
  10. 18. Icelandic Christmas cat
Down
  1. 1. Highest selling single of all time
  2. 2. Renowned American children's author Shel __
  3. 4. Modern Santa's creator
  4. 9. Largest Christmas gift ever given
  5. 12. Where Santa lives
  6. 13. First place to celebrate Christmas ugliness
  7. 15. One of Santa's reindeer
  8. 16. Large Alabanian Christmas gathering