Vocalist ____ Fitzgerald (4)
I believe the answer is:
ella
'vocalist fitzgerald' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ella that I've seen before include "Diminutive of Eleanor" , "Great late jazz singer . . . . Fitzgerald" , "Ms Fitzgerald" , "- Wheeler Wilcox, US poet" , "Woman" .)