Russian autocrat (5)
'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" .)
(Other definitions for putin that I've seen before include "Russian president" , "Introduce" , "powerful leader" , "Russian leader" .)