Meal for boxer? Not something that’s well done (4,9)
I believe the answer is:
dogs breakfast
'something that's well done' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'meal for boxer? not' is the wordplay.
'meal' becomes 'breakfast' (breakfast is a kind of meal).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'boxer? not' becomes 'dogs' (I am not sure about this - if you are sure you should believe this answer much more).
'breakfast' put after 'dogs' is 'DOGS BREAKFAST'.
Can you help me to learn more?
(Other definitions for dogs breakfast that I've seen before include "Complete mess" , "Darkest of bags (anag)" , "Mess (served to Fido?)" , "Mess, shambles" , "Pig's ear" .)