I ban no book after marvellous David Copperfield? (8)
I believe the answer is:
magician
'david copperfield?' is the definition.
(I know this)
'i ban no book after marvellous' is the wordplay.
'no' is a deletion indicator.
'book' becomes 'b' (abbreviation for book).
'after' says to put letters next to each other.
'marvellous' becomes 'magic' (I've seen this before).
'ban' with 'b' taken away is 'an'.
'i'+'an'='ian'
'ian' after 'magic' is 'MAGICIAN'.
(Other definitions for magician that I've seen before include "Stage conjurer or maker of legerdemain" , "Conjuror, wizard" , "Sorcerer, wizard" , "Conjurer, illusionist" , "Conjuror, illusionist" .)