Crossword Genius

As committed in the heat of the moment? (5)

Ross

I believe the answer is:

arson

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

'heat of the moment?' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?

'as committed in' is the wordplay.
'as' becomes 'so' (I've seen this in other clues).
'committed' becomes 'arn' (I can't explain this - if you can you should believe this answer much more).
'in' means one lot of letters goes inside another.
'so' going into 'arn' is 'ARSON'.

'the' is the link.

Can you help me to learn more?

(Other definitions for arson that I've seen before include "The act of firing" , "matchplay, say?" , "Fire-raising crime" , "burning problem" , "Fire requiring forensic study" .)

I've seen this clue in the Evening Standard.
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