Arouse revolutionary tribes (6)

I believe the answer is:

bestir

'arouse' is the definition.
(I've seen this in another clue)

'revolutionary tribes' is the wordplay.
'revolutionary' indicates anagramming the letters.
'tribes' anagrammed gives 'BESTIR'.

(Other definitions for bestir that I've seen before include "Become active" , "move" , "Rouse (oneself)" , "Exert/rouse (oneself)" .)

I've seen this clue in The Globe and Mail.

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