Crossword Genius

Pre-1917 ruler (4)

Ross

I believe the answer is:

tsar

'pre-1917 ruler' 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 "Nicholas II was the last" , "Russian leader" , "Supremo" , "Peter the Great, for example" , "Person in charge" .)

I've seen this clue in The Wall Street Journal.
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