One who urges others to protest (8)

I believe the answer is:

agitator

(Other definitions for agitator that I've seen before include "He stirs things up, causes trouble" , "Rabble-rouser - blender" , "Got tiara for a trouble-maker" , "Organiser" , "Stirrer up of public feeling" .)

I've seen this clue in the Sydney Morning Herald.

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