Push-up bra feature (3)
I believe the answer is:
pad
'push-up bra feature' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pad that I've seen before include "Helicopter stand" , "Fill with extra material in order to lengthen" , "Stuff the animal's foot" , "Protective guard; home" , "protection for member" .)