Heat unit (7)

I believe the answer is:

calorie

'heat unit' is the definition.
(calorie is a kind of heat unit)

This is the entire clue.

(Other definitions for calorie that I've seen before include "A recoil (anag.)" , "Food energy unit" , "Unit of energy in foods" , "generating a bit of heat" , "Unit of heat energy" .)

I've seen this clue in the Evening Standard.

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