Terrible ruler? (4)

I believe the answer is:

ivan

'terrible ruler?' is the definition.
(tsar of Russia Ivan the Terrible)

This is the entire clue.

(Other definitions for ivan that I've seen before include "Russian boy's name" , "Chap" , "Name of six Russian tzars" , "Fellow" , "terrible tyrant" .)

I've seen this clue in The Guardian.

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