Top part of a dress (6)
I believe the answer is:
bodice
'top part of a dress' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for bodice that I've seen before include "Top of a dress above the waist" , "Close-fitting top of a dress" , "Upper part of woman's dress" , "Top part of a dress" , "Sexually explicit historical novel" .)