Nonsense! Just refuse! (7)
I believe the answer is:
rubbish
I believe this clue is a double definition.
'nonsense' is the first definition.
(I know that nonsense can be written as rubbish)
'refuse' is the second definition.
(refuse can mean rubbish or waste)
'just' acts as a link.
(Other definitions for rubbish that I've seen before include "Dross - twaddle" , "Waste matter" , "Codswallop or trash" , "Waste; very bad (colloq.)" , "Stuff and nonsense" .)