Stop getting behind popular record label (5)
I believe the answer is:
indie
'record label' is the definition.
(I've seen this before)
'stop getting behind popular' is the wordplay.
'stop' becomes 'die' (as in a machine stopping or dying).
'getting behind' says to put letters next to each other (some letters go behind others).
'popular' becomes 'in' ('in' can mean trendy).
'die' put after 'in' is 'INDIE'.
(Other definitions for indie that I've seen before include "(Pop group) not affiliated to a major recording company" , "minor label" , "Unaffiliated pop group" , "Specialist record company" , "(Pop group) not affiliated with a major record company" .)