Stocking material (5)
I believe the answer is:
nylon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stocking material</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nylon that I've seen before include "Man-made fibre" , "Fibrous material" , "Stocking; polymer" , "Plastic used for stockings" , "Artificial fabric" .)