Pravda cofounder (5)
I believe the answer is:
lenin
'pravda cofounder' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lenin that I've seen before include "Revolutionary leader" , "Head of the Communist state after the fall of the Tsar" , "Marxist theoretician" , "Communist leader" , "Vladimir Ilyich -, Soviet premier" .)