Hoarfrost (4)

I believe the answer is:

rime

'hoarfrost' is the definition.
(I know that hoarfrost can be written as rime)

This is all the clue.

(Other definitions for rime that I've seen before include "Hoarfrost" , "Kind of frost in mire" , "dated poetry" , "Type of frost" , "Ice" .)

I've seen this clue in The Irish Times.

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