Provoke, stir up (6)
I believe the answer is:
incite
I believe this clue is a double definition.
'provoke' is the first definition.
(I know that incite is a more specific form of provoke)
'stir up' is the second definition.
(I know that stir up can be written as incite)
(Other definitions for incite that I've seen before include "Start" , "Trigger" , "Encourage to action" , "Encourage, urge" , "Stir up (trouble)" .)