Slavic ruler, once (4)
I believe the answer is:
tsar
(Other definitions for tsar that I've seen before include "Despot" , "Russian ruler (S, not Z)" , "Supremo" , "Old leader" , "Russian monarch" .)
I believe the answer is:
tsar
(Other definitions for tsar that I've seen before include "Despot" , "Russian ruler (S, not Z)" , "Supremo" , "Old leader" , "Russian monarch" .)