Old Russian ruler (4)

I believe the answer is:

tsar

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

This is the entire clue.

(Other definitions for tsar that I've seen before include "Star for a Russian emperor" , "Russian monarch" , "Rats (anag)" , "Supremo" , "Absolute ruler" .)

I've seen this clue in the L.A. Times Daily, The New York Times, the Irish Times (Simplex), the Wall Street Journal, The Irish Times, The Sun, the USA Today, the Universal and the LA Times.

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