Malicious fire-raising (5)
I believe the answer is:
arson
'malicious fire-raising' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for arson that I've seen before include "Incendiary crime" , "Incendiarism" , "Felonious burning of property" , "Sonar (anag.)" , "Fire-raiser's crime" .)