Performs again in response to prompting (6)

I believe the answer is:

reacts

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'performs again' is the definition.
('acts' is an answer for 'performs' so perhaps 'reacts' is OK for 'performs again')

I don't understand the remainder of the clue.

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(Other definitions for reacts that I've seen before include "Acts in response to something" , "Retaliates" , "Responds to an impulse" , "Responds to stimulus (6)" .)

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

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