Extra feature of novel, e.g. by Eliot (3,3)
I believe the answer is:
leg bye
'extra' is the definition.
(cricket term)
'feature of novel e g by eliot' is the wordplay.
'feature of' indicates the answer is hidden within the clue.
'LEG-BYE' is hidden in the letters of 'novel e g by eliot'.
(Other definitions for leg bye that I've seen before include "Extra run (cricket)" , "cricketer scoring off his pad" , "Type of run (cricket)" , "Extra 24 across" .)