Ethiopian emperor (5,8)
I believe the answer is:
haile selassie
'ethiopian emperor' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for haile selassie that I've seen before include "Emperor of Ethiopia, deposed 1974" , "The Rastafarian Messiah" , "Leader revered in Ethiopia" , "Ethiopian emperor" , "African emperor" .)