Chair or bench (4)
I believe the answer is:
seat
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">chair</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(something to sit on)</span><br/ ><br/ >'<span class="explanation-format__original">bench</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that bench can be written as seat)</span><br/ ><br/ ></span>
(Other definitions for seat that I've seen before include "Place to sit" , "Take one and sit" , "Sitting place" , "'A chair, say (4)'" , "Parliamentary constituency" .)