A tyrant (4)

I believe the answer is:

tsar

'a tyrant' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for tsar that I've seen before include "Eg, Ivan the Terrible" , "Tyrant" , "Star for a Russian emperor" , "Russian monarch" , "Title given to the kings of Bulgaria" .)

I've seen this clue in the Evening Standard.

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