Christmas eave decoration? (6)
I believe the answer is:
icicle
'christmas eave decoration?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for icicle that I've seen before include "Winter hanger" , "one hanging around in the cold" , "solidified dripping" , "A pendant spike of frozen water" , "Something tapering, seen in freezing weather" .)