Ballet skirts (5)
I believe the answer is:
tutus
'ballet skirts' is the definition.
('tutu' can be a synonym of 'ballet skirt')
This is the entire clue.
(Other definitions for tutus that I've seen before include "Ballet dresses" , "Ballet costumes" , "Ballet skirts" , "Certain dance outfits" , "Ballerinas' short skirts" .)