Window ledges (5)
I believe the answer is:
sills
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">window ledges</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 sills that I've seen before include "Ledges" , "Horizontal slabs under windows" .)