Notorious Idi (4)
I believe the answer is:
'notorious idi' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for amin that I've seen before include "Ugandan dictator" , "Idi . . . . Once ruled Uganda tyrannically" , "Former African despot" , "Dictator Idi --" , "'Last King of Scotland'" .)