Crossword Genius

Reflex reaction (4,4)

Ross

I think it could be either:

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8

4,4

knee jerk

(Other definitions for knee jerk that I've seen before include "instinctive" , "Type of automatic reaction" , "Sudden and ill-considered" , "(Of a response) automatic and unthinking" , "Such a predictable reaction" .)

I've seen this clue in The Guardian.
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