Russian autocrat (4)

I think it could be either:

Which length description are you looking for?:

tsar

'russian autocrat' 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 "Formal rulings on Islamic law; was aft (anag.)" , "Potentate" , "Tyrant" , "Male monarch" , "Star for a Russian emperor" .)

I've seen this clue in the LA Times and The Guardian.

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