Fire-setting crime (5)
I believe the answer is:
arson
'fire-setting crime' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for arson that I've seen before include "Fire-raising crime" , "Malicious crime" , "Roans (anag)" , "Sonar (anag.)" , "Illegally firing" .)