Crossword Genius

The heat of battle? (4)

Ross

I believe the answer is:

fire

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'the heat' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for fire that I've seen before include "There's no smoke without it" , "Blaze - sack" , "Sack; discharge (a gun)" , "Let off" , "Weaponry" .)

I've seen this clue in the Evening Standard.
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