Responds to a stimulus (6)

I believe the answer is:

reacts

'responds to a stimulus' is the definition.
(I've seen this before)

This is the entire clue.

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

I've seen this clue in The Irish Times and the USA Today.

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