Nugget Christmas

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Across
  1. 7. Small
  2. 9. So much older, so quickly
  3. 10. Dude
  4. 11. A mystery wrapper, in short
  5. 13. The most wonderful time of the year
  6. 15. Chalet warmer, for short
  7. 16. To paint on dry plaster with watery pigments
  8. 17. Two expressions of affection
  9. 19. Corky!
  10. 20. A growing smile on a shrinking head
  11. 21. A single from Treasure Island, across the way
Down
  1. 1. An expression of affection
  2. 2. An ablution monitor
  3. 3. Rigorously, stringently, closely
  4. 4. Of Gold or from Golden Arches
  5. 5. May field a Banstead colour
  6. 6. Leek-like
  7. 8. Don't eat him for fear of buttery footprints
  8. 12. An angry comment
  9. 14. Not a berry, that's for sure
  10. 15. The quintessential Love Bug
  11. 18. Don't jump!