You'll sing at Christmas time (4)

I believe the answer is:

yule

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'christmas time' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for yule that I've seen before include "Festival" , "Christmas-time" , "This time of year of old" , "Christmas season" , "festive tide" .)

I've seen this clue in the Sydney Morning Herald.

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