Leader of the Russian Revolution (5)
I believe the answer is:
lenin
'leader of the russian revolution' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for lenin that I've seen before include "First Soviet leader" , "Head of the Communist state after the fall of the Tsar" , "V. I. -, Soviet politician and revolutionary" , "First premier of the Soviet Union, d. 1924" , "Revolutionary leader" .)