Part of a chair (7)
I believe the answer is:
armrest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">part of a chair</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for armrest that I've seen before include "Part of sofa or chair" , "Support for one member" , "Chair or car seat part" , "support of chairperson?" , "giving a member support" .)