Crossword Genius

It’s heatedly destructive and that’s bad (5)

Ross

I believe the answer is:

arson

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'bad' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for arson that I've seen before include "Fire-raiser's crime" , "criminal fire-raising" , "Be pettish" , "Fire-raising crime" , "Incendiary act" .)

I've seen this clue in the Evening Standard.
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