Two-piece suit (6)
I believe the answer is:
bikini
'two-piece suit' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bikini that I've seen before include "Atoll and skimpy swimsuit" , "providing little cover for swimmers" , "Swimsuit for the beach" , "Brief two-piece swimming costume" , "Skimpy two-piece swimsuit" .)