She may be all set (6)
I believe the answer is:
stella
'she' is the definition.
(I've seen this before)
'may be all set' is the wordplay.
'may be' indicates anagramming the letters.
'all'+'set'='allset'
'allset' anagrammed gives 'STELLA'.
(Other definitions for stella that I've seen before include "Girl's name meaning star" , "Swift alias for Esther" , "____ McCartney, fashion designer" , "girl!" , "Paul McCartney's daughter" .)