Rubbish material (4)
I believe the answer is:
lame
This clue is a double definition.
'rubbish' is the first definition.
(I've seen this before)
'material' is the second definition.
(lame is a kind of material)
(Other definitions for lame that I've seen before include "Hobbling" , "Feeble; cripple" , "Thin plate" , "Halting or unconvincing like poor excuse" , "Unable to walk normally" .)