Material artist over there (5)
I believe the answer is:
rayon
'material' is the definition.
(rayon is a type of fabric)
'artist over there' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'over there' becomes 'yon' (archaic word meaning 'over there').
'ra'+'yon'='RAYON'
(Other definitions for rayon that I've seen before include "Material - or any (anag)" , "Viscose fibre" , "Or any (anag) -- fibre" , "Synthetic silk-like fabric" , "Artificial material" .)