Process for re-use (7)
I believe the answer is:
recycle
'process for re-use' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for recycle that I've seen before include "Process for further use" , "salvage for further use" , "Keep and use again" , "To use up left-overs" , "Use (waste) again" .)