Provocative arsonist (10)
I believe the answer is:
incendiary
I believe this clue is a double definition.
'provocative' is the first definition.
(something incendiary provokes conflict)
'arsonist' is the second definition.
(I know that arsonist can be written as incendiary)
(Other definitions for incendiary that I've seen before include "bomb" , "Inciting riot" , "tending to stir up trouble" , "of a provocative nature" , "getting people excited" .)