Crossword Genius

Russian physiologist (6)

Ross

I believe the answer is:

pavlov

'russian physiologist' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for pavlov that I've seen before include "Russian psychologist" , "Russian who studied the conditioned reflex using dogs" , "conditioner" , "Russian who studied animals' reflexes" , "Ivan --, Russian studier of conditioned reflexes" .)

I've seen this clue in The Sun.
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