Artificial silk fabric (5)
I believe the answer is:
rayon
'artificial silk fabric' is the definition.
(I've seen this before)
This is all the clue.
(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" .)