____ Fitzgerald of jazz (4)
I believe the answer is:
ella
'fitzgerald of jazz' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ella that I've seen before include ".... Fitzgerald, late great jazz diva" , "Diminutive of Eleanor" , "- Wheeler Wilcox, US poet" , "Miss" , "- - Fitzgerald (mus.)" .)