Style of window (4)
I believe the answer is:
sash
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">style of window</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sash that I've seen before include "Strip of cloth worn round the waist" , "type of cord?" , "Framework holding window panes" , "Type of sliding window" , "seen hanging around Miss World?" .)