Russian monarch (4)

I believe the answer is:

tsar

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

This is the entire clue.

(Other definitions for tsar that I've seen before include "Tyrant" , "Supremo" , "Nicholas II was the last" , "Russian monarch" , "Once-powerful Russian" .)

I've seen this clue in the LA Times and the Sydney Morning Herald.

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