Spear of frozen water (6)
I believe the answer is:
icicle
'spear of frozen water' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for icicle that I've seen before include "Cold hanger" , "Tapering frozen water" , "Spear-like shape formed by the freezing of dripping water" , "Something hanging in winter" , "one hanging around in the cold" .)