Anger relatable to race (4)

I believe the answer is:

heat

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'anger' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for heat that I've seen before include "eliminating round" , "Preliminary race to qualify finalists" , "Warmth - passion" , "Energy that caues a rise in temperature" , "brings out a sweat?" .)

I've seen this clue in the Evening Standard.

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