Crossword Genius

Frost's old-fashioned poem (4)

Ross

I believe the answer is:

rime

I believe this is a double definition.

'frost's' is the first definition.
(rime is frost by freezing water vapour)

'old-fashioned poem' is the second definition.
(archaic spelling of 'rhyme')

(Other definitions for rime that I've seen before include "Hoar frost" , "Hoarfrost" , "Ice" , "Type of frost" , "Ancient Mariner produced?" .)

I've seen this clue in The Guardian.
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