At a very high temperature (3,3)

I think it could be either:

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3,3

red hot

'at a very high temperature' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for red hot that I've seen before include "Sexy" , "Very busy" , "At a very high temperature" , "highly emotional" , "Sizzling" .)

I've seen this clue in The Guardian.

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