Part of the body (5)
I believe the answer is:
waist
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">part of the body</span>' is the definition.<br/ ><span class="explanation-format__explanation">(the waist is a part of the body)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)