What scrap material has fallen into (6)
I believe the answer is:
disuse
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for disuse that I've seen before include "Neglect; abandonment" , "State of not being employed" , "Fall into this state to be unemplyed? (6)." , "Neglect; desuetude" , "Issued (anag)" .)