Curtain fabric (5)
I believe the answer is:
scrim
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">curtain fabric</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 scrim that I've seen before include "A loosely-woven cotton fabric" , "material" , "Open-weave muslin fabric" .)