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All answers having "Christmas ___" as clue:

3 Character Answers:

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EVE

PIE



4 Character Answers:

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NOEL

SEAL

TREE

WEEK

XMAS

YULE



5 Character Answers:

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CAROL

MERRY

SEALS

TREES

WHITE



6 Character Answers:

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AWHITE

SPIRIT

TINSEL



7 Character Answers:

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HOLIDAY

PRESENT



8 Character Answers:

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YULETIDE



10 Character Answers:

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PRESENTDAY