Man in power-sharing arrangement with former dictator reveals Guardian (8)
I believe the answer is:
chaperon
'guardian' is the definition.
(I know that chaperon is a type of guardian)
'man in power-sharing arrangement' is the wordplay.
'man' becomes 'chap' (term for a man).
'in power sharing arrangement' becomes 'eron' (I am not sure about this - if you are sure you should believe this answer much more).
'chap'+'eron'='CHAPERON'
'with former dictator reveals' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for chaperon that I've seen before include "Accompany and look after" , "One accompanies the vulnerable" , "Preach on about older woman in charge of girl" , "Attendant" , "Girl minder from Cape Horn" .)