Projecting window (5)
I believe the answer is:
oriel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">projecting window</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for oriel that I've seen before include "place to study at Oxford" , "Projecting window in upper storey" , "Opening" , "polygonal recess" , "Window built out from upper floor" .)