Provoke (trouble or rebellion) (6)

I believe the answer is:

foment

(Other definitions for foment that I've seen before include "Stir up, cause trouble" , "Arouse or stimulate, maybe trouble" , "produce a stir" , "Arouse or stimulate, perhaps trouble" , "Arouse or stimulate, say trouble" .)

I've seen this clue in The Times.

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