Yalta Conference attendee (6)
I believe the answer is:
stalin
'yalta conference attendee' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stalin that I've seen before include "Dreaded dictator among Latins" , "Joseph -, Russian World War two dictator" , "Communist dictator" , "Mass-murderer" , "Former USSR leader" .)