Crossword Genius

Russian ruler until 1917 (4)

Ross

I believe the answer is:

tsar

'russian ruler until 1917' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for tsar that I've seen before include "Rats (anag)" , "Potentate" , "Alexander and Nicholas held this title in Russia" , "One associated with 26 [KREMLIN]" , "A former Russian ruler - rats to him" .)

I've seen this clue in the LA Times and the Universal.
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