Good clean entertainment? Not musical, though (4,5)
I believe the answer is:
soap opera
'not musical though' is the definition.
I can't judge whether this defines the answer.
'good clean entertainment?' is the wordplay.
'good clean' becomes 'soap' (soaping is a kind of cleaning. I am not sure about the 'good' bit.**).
'entertainment?' becomes 'opera' (I've seen this before).
'soap'+'opera'='SOAP-OPERA'
(Other definitions for soap opera that I've seen before include "addictive programme?" , "Sentimental TV serial, sounds clean" , "Serialised domestic melodrama on TV or radio" , "Television serial" , "Melodramatic TV serial" .)