Crossword Genius

Cooled the unusually red fire grate (12)

Ross

I believe the answer is:

refrigerated

'cooled' is the definition.
(refrigerating is a kind of cooling)

'the unusually red fire grate' is the wordplay.
'the unusually' is an anagram indicator.
'red'+'fire'+'grate'='redfiregrate'
'redfiregrate' anagrammed gives 'REFRIGERATED'.

I've seen this clue in The Globe and Mail.
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