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Unit of heat energy (7)

Ross

I think it could be either:

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5

7

calorie

'unit of heat energy' is the definition.
(I've seen this before)

This is the entire clue.

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

I've seen this clue in The Guardian and The Wall Street Journal.
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