Excites, troubles (8)
I believe the answer is:
agitates
I believe this clue is a double definition.
'excites' is the first definition.
('agitate' can be a synonym of 'excite')
'troubles' is the second definition.
(agitating is a kind of troubling)
(Other definitions for agitates that I've seen before include "Disturbs, often politically" , "Upsets" , "Tries to stir up public opinion" , "Disturbs or stirs up political trouble" .)