Cancel e-book about A-lister (5)
I believe the answer is:
celeb
'a-lister' is the definition.
(I've seen this in another clue)
'cancel e-book about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'CELEB' is hidden in the letters of 'cancel e book'.
(Other definitions for celeb that I've seen before include "popular star" , "Prominent figure" , ""Personality"" , "Famous person (abbr)" , "Big name" .)