Displaying a chest without a lid (7)
I believe the answer is:
topless
I believe this clue is a double definition.
'displaying a chest' is the first definition.
(not wearing anything over one's chest)
'without a lid' is the second definition.
('lid' can be 'top' (eg a bottle top) so maybe 'without a lid' can be ''topless')
(Other definitions for topless that I've seen before include "With chest totally exposed" , "Bare-breasted" , "Revealing" , "Half-naked" , "Bare from the waist up" .)