One making advances on councillor and film maker (8)
I believe the answer is:
creditor
'one making advances' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'councillor and film maker' is the wordplay.
'councillor' becomes 'cr' (abbreviation).
'and' is a charade indicator (letters next to each other).
'film maker' becomes 'editor' (I can't justify this - if you can you should believe this answer much more).
'cr'+'editor'='CREDITOR'
'on' acts as a link.
Can you help me to learn more?
(Other definitions for creditor that I've seen before include "he advances to you" , "One who's owed money" , "recipient of money" , "The one to whom debt is due" , "Moneylender" .)