Nasty demonstration is a bit of an act (5)

I believe the answer is:

scene

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'bit of an act' is the definition.
(theatrical acts are divided into scenes)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for scene that I've seen before include "bit of an act" , "A row - or a view" , "Subdivision of a play/film" , "Vista or stage setting" , "View -part of play" .)

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

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