Barman produces two types of music that could be recycled or discarded as rubbish (10)
I believe the answer is:
scrapmetal
'barman produces two types of music that could be recycled' is the definition.
The definition and answer are not the same part of speech.
'discarded as rubbish' is the wordplay.
'discarded' becomes 'scrap' (synonyms).
'as rubbish' becomes 'metal' (I am not sure about this - if you are sure you should believe this answer much more).
'scrap'+'metal'='SCRAPMETAL'
'or' acts as a link.
Can you help me to learn more?
(Another definition for scrapmetal that I've seen is " "Old iron"".)