Jazz's ____ Fitzgerald (4)
I believe the answer is:
ella
'jazz's fitzgerald' 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 "Woman" , ".... Fitzgerald, late great jazz diva" , "---- Fitzgerald, 'Queen of Jazz'" , "- Wheeler Wilcox, US poet" , "- - Fitzgerald (mus.)" .)