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 LA Times, The Irish Times, the L.A. Times Daily, The Sun, the Wall Street Journal, the USA Today, the Irish Times (Simplex), the Universal and the New York Times.

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