Backless seat (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">backless seat</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for stool that I've seen before include "item of furniture here" , "Seat without a back" , "Armless seat" , "Three-legged backless seat" , "Motion" .)
(Other definitions for divan that I've seen before include "Couch - bed" , "Sideless, backless couch" , "resting place" , "Viand (anag.)" , "Sort of bed" .)