Gold rubbish I'd returned, one hears (7)
I believe the answer is:
auditor
'one hears' is the definition.
(a person who hears is an auditor)
'gold rubbish i'd returned' is the wordplay.
'gold' becomes 'au' (Au is the chemical symbol for gold).
'rubbish' becomes 'rot' (I've seen this before).
'returned' says the letters should be written in reverse.
'rot'+'id'='rotid'
'rotid' backwards is 'ditor'.
'au'+'ditor'='AUDITOR'
(Other definitions for auditor that I've seen before include "Listener; checker" , "One certifying accounts" , "Examiner of accounts" , "Checker of books" , "Accounts checker" .)