Crossword Genius

Turned tepid only in a cutting way (9)

Ross

I believe the answer is:

pointedly

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'in a cutting way' is the definition.
I can't judge whether this definition defines the answer.

'turned tepid only' is the wordplay.
'turned' indicates anagramming the letters.
'tepid'+'only'='tepidonly'
'tepidonly' anagrammed gives 'POINTEDLY'.

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I've seen this clue in The Mirror and The Daily Express.
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