Fictional boy who asked for more (6)
I believe the answer is:
oliver
'fictional boy who asked for more' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for oliver that I've seen before include "Dickens boys who asked for more" , "See 19" , "The boy who wanted more" , "Dickens boy who asked for more, and a musical comedy" , "Musical (with a Twist!)" .)