Crossword Genius

Bygone ruler (4)

Ross

I think it could be either:

tsar

czar

'bygone 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 "Rats (anag)" , "Once-powerful Russian" , "Russian ruler (S, not Z)" , "Word derived from Caesar, used by European rulers since 1547" , "Russian leader" .)

I've seen this clue in the King Feature Syndicate.
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