Supply only new material (5)
I believe the answer is:
nylon
'material' is the definition.
(nylon is a kind of material)
'supply only new' is the wordplay.
'supply' indicates anagramming the letters (in a supple way).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'only' anagrammed gives 'nylo'.
'nylo'+'n'='NYLON'
(Other definitions for nylon that I've seen before include "where ladder can appear?" , "may be damaged by running" , "Man-made fibre" , "Artific ial (stocking) material" , "A thermoplastic" .)