Environmentally sound instrument sounded like a raw beginner (9)
I believe the answer is:
greenhorn
'beginner' is the definition.
(I know that greenhorn is a type of beginner)
'environmentally sound instrument' is the wordplay.
'environmentally sound' becomes 'green' (I've seen this before).
'instrument' becomes 'horn' (horn is a kind of instrument).
'green'+'horn'='GREENHORN'
'sounded like a raw' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for greenhorn that I've seen before include "One's not experienced" , "Tenderfoot" , "colt" , "Inexperienced fellow" , "Rookie (American)" .)