Synthetic material - or any material? (5)
I believe the answer is:
rayon
'synthetic material' is the definition.
(I know that rayon is a type of synthetic fiber)
'or any material?' is the wordplay.
'material?' indicates an anagram (the letters provide the material for a new word).
'or'+'any'='orany'
'orany' with letters rearranged gives 'RAYON'.
(Other definitions for rayon that I've seen before include "Artificial silk fabric" , "Material - or any (anag)" , "Or any (anag) -- fibre" , "Artificial fibre" , "Silklike material" .)