Is story about tennis star? (6)
I believe the answer is:
agassi
'tennis star?' is the definition.
(I've seen this before)
'is story about' is the wordplay.
'story' becomes 'saga' (a saga is a long story).
'about' says the letters should be written backwards.
'is'+'saga'='issaga'
'issaga' reversed gives 'AGASSI'.
(Other definitions for agassi that I've seen before include "champion of the court?" , "Andre --, tennis player" , "tennis star" , "Andre --, tennis champ" .)