Sing like Ella Fitzgerald (4)
I believe the answer is:
scat
'sing like ella fitzgerald' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for scat that I've seen before include "Type of jazz singing - be off!" , "Jazz singing - animal droppings - silvery fish" , "Get away with cats" , "Shoo!" , "Jazz-singing" .)