Russian title derived from "Caesar" (4)

I believe the answer is:

tsar

(Other definitions for tsar that I've seen before include "One associated with 26 [KREMLIN]" , "Potentate" , "Autocrat" , "Eg, Ivan the Terrible" , "Person in charge" .)

I've seen this clue in the USA Today, The New York Times and the Universal.

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