Ellington of jazz (4)
I believe the answer is:
duke
'ellington of jazz' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for duke that I've seen before include "Highest-ranking nobleman" , "- - Ellington (jazz musician)" , "Member of the nobility" , "noble" , "Fist (sl.)" .)