Gold firm in Republican America making noise (7)
I believe the answer is:
'gold firm in republican america making noise' is the definition.
I can't judge whether this definition defines the answer.
'gold firm in republican america' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'firm' becomes 'co' (a firm is a company).
'in' is an insertion indicator.
'republican' becomes 'r' (abbreviation).
'america' becomes 'US' (United States).
'auco' put into 'rus' is 'RAUCOUS'.
Can you help me to learn more?
(Other definitions for raucous that I've seen before include "Rowdy - strident" , "Loud and discordant" , "Unpleasantly noisy" , "Harsh, noisy" , "Harsh in sound" .)