Crossword Genius

First artificial silk (5)

Ross

I believe the answer is:

rayon

(Other definitions for rayon that I've seen before include "Material - or any (anag)" , "Or any (anag) -- fibre" , "No ray (anag)" , "Artificial material" , "Cellulose fabric" .)

I've seen this clue in The Times and The Sunday Times.
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