Show what discontented groups do (11)

I believe the answer is:

demonstrate

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'show' is the definition.
(I know that show can be written as demonstrate)

I don't understand the rest of the clue.

(Other definitions for demonstrate that I've seen before include "Review" , "Take part in public protest" , "English floozies returning, led by villainous character" , "Show or display" , "Prove, show" .)

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

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