One who is responsible for every darling traitor getting gold (11)
I believe the answer is:
perpetrator
'one who is responsible' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'every darling traitor getting gold' is the wordplay.
'every' becomes 'per' ('per' means 'for each' or 'for every').
'darling' becomes 'pet' (both are terms of endearment).
'traitor' becomes 'rat' (rat can mean a treacherous person).
'getting' means one lot of letters go next to another.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'per'+'pet'+'rat'+'or'='PERPETRATOR'
'for' is the link.
Can you help me to learn more?
(Other definitions for perpetrator that I've seen before include "agent" , "One who commits a bad action" , "One committing (an offence)" , "One committing (a bad deed)" , "responsible individual" .)