Pre-1917 Russian ruler (4)

I believe the answer is:

tsar

'pre-1917 russian ruler' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tsar that I've seen before include "One associated with 26 [KREMLIN]" , "Old Russian ruler" , "A former Russian ruler - rats to him" , "Male monarch" , "Person in charge" .)

I've seen this clue in the USA Today and the Universal.

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