Russian ruler (4)

I believe the answer is:

tsar

'russian ruler' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tsar that I've seen before include "Once-powerful Russian" , "Tyrant" , "Person in charge" , "Russian monarch" , "Russian ruler (S, not Z)" .)

I've seen this clue in the Penny Press, The Independent, the King Feature Syndicate, The Wall Street Journal, The Mirror and The Star Tribune.

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