Left after meal to pen book still topping the lists? (8)
I believe the answer is:
unbeaten
'still topping the lists?' is the definition.
I can't judge whether this defines the answer.
'left after meal to pen book' is the wordplay.
'left after meal' becomes 'uneaten' (I am not sure about this - if you are sure you should believe this answer much more).
'to pen' indicates putting letters inside.
'book' becomes 'b' (abbreviation for book).
'uneaten' enclosing 'b' is 'UNBEATEN'.
Can you help me to learn more?
(Other definitions for unbeaten that I've seen before include "Always winning" , "having at worst drawn badly?" , "Not yet defeated" , "Not punished" , "Victorious" .)