Crossword Genius

Anger created by arson? (4)

Ross

I believe the answer is:

heat

I'm a little stuck... Click here to teach me more about this clue!

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

'by arson?' is the wordplay.
I cannot quite see how this works, but
'by' could be 'at' and 'at' is located in the answer.
The remaining letters 'he' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'created' acts as a link.

Can you help me to learn more?

(Other definitions for heat that I've seen before include "Energy that caues a rise in temperature" , "Warm up" , "It's measured in therms" , "Hotness" , "brings out a sweat?" .)

I've seen this clue in the Evening Standard.
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