Incitement to rebellion (8)
I believe the answer is:
sedition
'incitement to rebellion' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sedition that I've seen before include "Criminal behaviour" , "Conduct inciting rebellion" , "Treason - it is done (anag)" , "incitement to rebel" , "Offence against state" .)