Respond to a stimulus (5)

I believe the answer is:

react

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

This is all the clue.

(Other definitions for react that I've seen before include "Acknowledge" , "provide an answer" , "Respond emotionally" , "Respond to something" , "Show opposition" .)

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

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