Crossword Genius

Clear December decoration (6)

Ross

I believe the answer is:

icicle

(Other definitions for icicle that I've seen before include "Winter spike" , "solidified dripping" , "Frozen water drip" , "Frozen water-drips" , "Spear-like shape formed by the freezing of dripping water" .)

I've seen this clue in the USA Today.
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