Rubbish on a list (4)
I believe the answer is:
rota
'list' is the definition.
(I know that rota is a type of roll)
'rubbish on a' is the wordplay.
'rubbish' becomes 'rot' (both can mean nonsense).
'on' means one lot of letters go next to another.
'rot'+'a'='ROTA'
(Other definitions for rota that I've seen before include "List of duties taken in turn" , "Repetitious canon" , "Working times list" , "Work schedule" , "Work roster" .)