Two-piece swimsuit (6)
I believe the answer is:
bikini
'two-piece swimsuit' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bikini that I've seen before include "revealing clothing" , "A-test atoll - type of wax?" , "Beach wear" , "Site of A-Bomb tests; resultantly shocking swimwear!" , "strip of beach" .)