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

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