Wrinkle on new material (5)
I believe the answer is:
linen
'material' is the definition.
(linen is a kind of material)
'wrinkle on new' is the wordplay.
'wrinkle' becomes 'line' ('line' can be a synonym of 'wrinkle'**).
'on' says to put letters next to each other.
'new' becomes 'n'.
'line'+'n'='LINEN'
(Other definitions for linen that I've seen before include "Flaxen fabric" , "Underclothing" , "Flax product" , "Fabric woven from flax fibres" , "Fabric, originally just spun flax" .)