Ballet garment (4)
I believe the answer is:
tutu
'ballet garment' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tutu that I've seen before include "Archbishop Desmond" , "Giselle's skirt" , "South African archbishop, b. 1931" , "Ballet-dancer's skirt" , "Ballet dress" .)