Fairy-tale ball attendee (10)
I believe the answer is:
cinderella
'fairy-tale ball attendee' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cinderella that I've seen before include "[FAIRY STORY REF]" , "a success in the end?" , "8 [BALLET]" , "Poor unhappy girl who meets her Prince Charming" , "Fairy tale heroine" .)