Infamous Idi (4)
I believe the answer is:
amin
'infamous idi' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for amin that I've seen before include "Former African despot" , "'Last King of Scotland'" , "Dictator Idi --" , "Brutal dictator" , "Ugandan dictator" .)