Abdicator of 1917 (4)

I believe the answer is:

tsar

'abdicator of 1917' 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 "Powerful man" , "Title of Russian emperor" , "Supreme authority" , "Star for a Russian emperor" , "Male monarch" .)

I've seen this clue in the Penny Press.

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