Music style picked up pop jargon (8)
I believe the answer is:
parlance
'jargon' is the definition.
(both can mean lingo or terminology)
'music style picked up pop' is the wordplay.
'music style' becomes 'rap' (musical genre).
'picked up' says the letters should be written in reverse.
'pop' becomes 'lance' (as in popping or lancing a boil).
'rap' in reverse letter order is 'par'.
'par'+'lance'='PARLANCE'
(Other definitions for parlance that I've seen before include "Manner of speaking peculiar to a specific group" , "Conversation" , "Idiom" , "Language" , "talk!" .)