Niche; recess (4)
I believe the answer is:
nook
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">niche</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">recess</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(a nook is an architectural recess)</span><br/ ><br/ ></span>
(Other definitions for nook that I've seen before include "Hidey-hole" , "Recess offering seclusion" , "Small space" , "shady retreat" , "cosy retreat" .)