Part of the body (5)
I believe the answer is:
waist
'part of the body' is the definition.
(the waist is a part of the body)
This is all the clue.
(Other definitions for waist that I've seen before include "Central part of body" , "Middle part of a ship" , "Middle part of the body" , "Part of the trunk" , "Narrow part of body" .)