Attractive Liberal replacing daughter in light entertainment (6)
I believe the answer is:
comely
'attractive' is the definition.
(thesaurus)
I can't explain the rest of the clue.
(Other definitions for comely that I've seen before include "Pleasant looking" , "'Very pleasing to the eye, a de Valera maiden perhaps (6)'" , "Very pleasing to the eye, as Dev's maidens perhaps" , "Old word for good-looking, perhaps a maiden" , "Pleasing, graceful" .)