I clean myself, do you hear? Nonsense! (7)
I believe the answer is:
eyewash
'nonsense' is the definition.
(I've seen this before)
'i clean' is the wordplay.
'i' becomes 'eye' (I've seen this in other clues).
'clean' becomes 'wash' (washing is a kind of cleaning).
'eye'+'wash'='EYEWASH'
'myself do you hear?' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
(Other definitions for eyewash that I've seen before include "Bunk" , "Nonsense (informal)" , "Rhubarb" , "this is soothing sight" , "Slangy nonsense or optical cleanser" .)