Vehicles caught leaving concerning crime (5)

I believe the answer is:

arson

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

I can't explain the remainder of the clue.

(Other definitions for arson that I've seen before include "Malicious burning to destroy property" , "Felonious burning of property" , "Crime of fire raising" , "The act of firing" , "Criminal activity" .)

I've seen this clue in The Guardian.

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