Undergarment with an underwire (3)
I believe the answer is:
bra
'undergarment with an underwire' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bra that I've seen before include "one carrying chest" , "support" , "I give a couple a lift" , "Underwear item" , "Chest supporter" .)