Socialist leader, a sort disturbed by Conservative (6)
I believe the answer is:
castro
'socialist' is the definition.
(Fidel Castro, former president of Cuba)
'leader a sort disturbed by conservative' is the wordplay.
I cannot really see how this works, but
'a' is within the answer.
an anagram of 'sort' is 'stro' which is present in the answer.
'conservative' could be 'c' (UK political abbreviation) and 'c' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for castro that I've seen before include "Fidel ......, Cuban chief" , "Cuban leader, d. 2016" , "Cuban dictator" , "Fidel . . . . . .,retired Cuban leader" , "Actors in Cuba" .)