Pop music playing, which is ideal (7)
I believe the answer is:
paragon
'is ideal' is the definition.
(I've seen this in another clue)
'pop music playing' is the wordplay.
'pop' becomes 'pa' (both can mean father).
'music' becomes 'rag' (rag is a kind of music).
'playing' becomes 'on' (on can mean playing or performing).
'pa'+'rag'+'on'='PARAGON'
'which' acts as a link.
(Other definitions for paragon that I've seen before include "Perfect embodiment of a concept" , "Model of conduct" , "A Model of excellence, perfect person" , "A model as of virtue" , "Role model" .)