Communist playing knotty roles (4,7)
I believe the answer is:
leon trotsky
'communist' is the definition.
(I know that Leon Trotsky is a Bolshevik)
'playing knotty roles' is the wordplay.
'playing' is an anagram indicator.
'knotty'+'roles'='knottyroles'
'knottyroles' is an anagram of 'LEON TROTSKY'.
(Other definitions for leon trotsky that I've seen before include "Revolutionary" , "Old red, d. 1940" .)