Winter eavesdropper? (6)
I believe the answer is:
icicle
'winter eavesdropper?' is the definition.
(an icicle might hang down from an eaves)
This is all the clue.
(Other definitions for icicle that I've seen before include "solidified dripping" , "Hanging ice spike" , "Cold hanger" , "Spear-like shape formed by the freezing of dripping water" , "Spear of ice" .)