Serious crime (5)

I think it could be either:

Which length description are you looking for?:

arson

'serious crime' is the definition.
(crime of starting a fire)

This is the entire clue.

(Other definitions for arson that I've seen before include "Malicious fire-lighting" , "Criminal burning of property" , "Fire-raiser's crime" , "Malicious fire-raising" , "Fire-lighting crime" .)

I've seen this clue in The Telegraph.

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