Frost formed by the freezing of water droplets in fog onto solid objects (4)

I believe the answer is:

rime

(Other definitions for rime that I've seen before include "Hoarfrost" , "Ancient Mariner produced?" , "''The ... of the Ancient Mariner'' (Coleridge)" , "Kind of frost in mire" , "dated poetry" .)

I've seen this clue in The Mirror.

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