Very last of troupe to quit demonstration (5)

I believe the answer is:

rally

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'demonstration' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for rally that I've seen before include "Large gathering" , "Recover; sequence of shots" , "Recover; car race" , "Arouse for action" , "Marshal" .)

I've seen this clue in The Guardian.

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