Crossword Genius

Former Russian emperor (4)

Ross

I believe the answer is:

tsar

(Other definitions for tsar that I've seen before include "Ruler finally executed" , "Alexander and Nicholas held this title in Russia" , "Powerful man" , "specific authority" , "Title of Russian emperor" .)

I've seen this clue in the USA Today, the Universal, the Sydney Morning Herald, the Evening Standard and The Daily Mail.
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