Waste, debris (8)
I believe the answer is:
detritus
I believe this is a double definition.
'waste' is the first definition.
(I know that detritus is a type of rubbish)
'debris' is the second definition.
(I know that debris can be written as detritus)
(Other definitions for detritus that I've seen before include "Bits and pieces of rubbish" , "Gravel or loose matter produced by erosion" , "Accumulated debris" , "waste material" , "Loose eroded matter" .)