Heated, or trendy, primarily? (3)

I believe the answer is:

hot

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'heated' is the definition.
(similar in meaning)

I can't explain the remainder of the clue.

(Other definitions for hot that I've seen before include "Under the collar, it means anger" , "Having a high temperature" , "Angry or very warm" , "Flaming - stolen" , "SECOND PART OF 11" .)

I've seen this clue in The Times.

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