Jeans material (5)
I believe the answer is:
denim
'jeans material' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for denim that I've seen before include "Fabric used for jeans" , "Hard-wearing blue fabric" , "Hard-wearing material seen in jeans" , "Hard-wearing clothing material, twilled cotton" , "Hard-wearing cloth" .)