"Terrible” czar (4)

I believe the answer is:

ivan

'terrible czar' 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 "man who had a terrible reputation" , "his progress in history was terrible!" , "__ Lendl, Czech-born American tennis star" , "in Russian history" , "'Terrible' emperor of Russia" .)

I've seen this clue in The Wall Street Journal and The New York Times.

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