Winter frost (4)

I believe the answer is:

hoar

'winter frost' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for hoar that I've seen before include "A kind of white frost" , "Rime" , "Type of frost" , "Here are ice crystals" , "Greyish-white with age or frost" .)

I've seen this clue in the King Feature Syndicate, the Wall Street Journal, the Family Time, the Universal and the New York Times.

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