Artificial silk fabric (5)
I believe the answer is:
rayon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">artificial silk fabric</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 rayon that I've seen before include "Artificial silk fabric" , "Or any (anag) -- fibre" , "No ray (anag)" , "Artificial fibre" , "Synthetic silk-like fabric" .)