Cover performer of rhythmic music on the radio? (7)
I believe the answer is:
wrapper
'cover' is the definition.
(I've seen this before)
'performer of rhythmic music on the radio?' is the wordplay.
'performer of rhythmic music' becomes 'rapper' (rapping is speaking to a rhythm).
'on the radio?' shows a homophone (sound like) (I've seen 'on the radio' mean this).
'rapper' sounds like 'WRAPPER'.
(Other definitions for wrapper that I've seen before include "(Sweet) paper" , "cover version" , "Packaging" , "band" , "Paper covering a magazine, say" .)