Only playing new material (5)
I believe the answer is:
nylon
'material' is the definition.
(nylon is a kind of material)
'only playing new' is the wordplay.
'playing' is an anagram indicator.
'new' becomes 'n'.
'only' is an anagram of 'nylo'.
'nylo'+'n'='NYLON'
(Other definitions for nylon that I've seen before include "Man-made fibre" , "Artificial fabric" , "Synthetic cloth" , "Tights material" , "Fibre of polymeric amides" .)