It's said I clean rubbish (7)
I believe the answer is:
eyewash
'rubbish' is the definition.
(both can mean nonsense)
'it's said i clean' is the wordplay.
'it's said' indicates a 'sounds like' (homophone) clue.
'clean' becomes 'wash' (washing is a kind of cleaning).
'i' is a homophone of 'eye'.
'eye'+'wash'='EYEWASH'
(Other definitions for eyewash that I've seen before include "Optic solution to relieve irritation - rubbish!" , "Bunk" , "Balderdash" , "Pupils may benefit from this" , "Nonsense; cleansing lotion" .)