Merry Christmas

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Across
  1. 4. Author of 'How the Grinch stole Christmas' (2,5)
  2. 6. a gift given by one of the Wise Men (5)
  3. 7. Guardian angel in 'It's a Wonderful Life' (8)
  4. 8. juice used in a Cosmopolitan cocktail (9)
  5. 11. German name for Christmas (10)
  6. 13. city whose Christmas market is affiliated with one held in Birmingham (9)
  7. 15. ... roasting on a open fire (9)
  8. 18. time leading to Christmas Day, from the latin word for 'arrival' (6)
  9. 19. the more common name for St Stephen's Day (6,3)
  10. 22. character played by Burt Ward in a 1960s series (5)
Down
  1. 1. Latin name for ivy (6)
  2. 2. a feeder made of carved stone or wood (6)
  3. 3. bird which Benjamin Franklin wanted to make the nation bird of the US (6)
  4. 5. English name of a carol composed in 1818 in Austria (6,5)
  5. 9. Parasitic plant - latin name 'viscum album' (9)
  6. 10. In the meadow we can build a snowman, then pretend that he is ... (6,5)
  7. 12. Christmas film starring Martin Freeman(8)
  8. 14. name of one of the Wise Men (8)
  9. 16. country which donates the Trafalgar Square Christmas tree (6)
  10. 17. a decoration whose name comes from the Old French word 'estincele' (6)
  11. 20. One of Santa's reindeer (6)
  12. 21. traditionally burnt on a hearth at Christmas (4,3)