Bathing-suit part (3)
I believe the answer is:
bra
'bathing-suit part' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bra that I've seen before include "I give a couple a lift" , "Underwear item" , "Chest supporter" , "Female undergarment" , "one carrying chest" .)