Chap with no new material (5)
I believe the answer is:
rayon
'material' is the definition.
(rayon is a kind of material)
'chap with no new' is the wordplay.
'chap' becomes 'ray' (**).
'with' is a charade indicator (letters next to each other).
'new' indicates an anagram.
'no' is an anagram of 'on'.
'ray'+'on'='RAYON'
(Other definitions for rayon that I've seen before include "Artificial fibre" , "Cellulose textile fibre" , "Imitation silk" , "Man-made fibre" , "Semi-synthetic material" .)