Yule (4)
'yule' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for noel that I've seen before include "Xmas refrain" , "Christmas carol" , "Another word for 7 Across" , "seasonal festival" , "Fellow" .)
(Other definitions for log that I've seen before include "fuel consumed" , "Bulky piece of wood" , "Diary kept by ship's captain" , "Record; cut wood" , "Official record of events" .)