Snowman in a Christmas song written by Walter "Jack" Rollins and Steve Nelson in 1950 (6)

I believe the answer is:

frosty

(Other definitions for frosty that I've seen before include "showing little enthusiasm" , "Cold and unfriendly (glance or reception?)" , "Icy cold" , "Lacking in warmth" , "Chilly in attitude, like musical snowman" .)

I've seen this clue in The Independent.

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