Crossword Genius

Physiologist Pavlov (4)

Ross

I believe the answer is:

ivan

'physiologist pavlov' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ivan that I've seen before include "- - the Terrible (Czar)" , "First tsar of Russia" , "Russian, say" , "terrible tyrant" , "Vain (anag) - Tsar of Russia" .)

I've seen this clue in The Wall Street Journal.
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