Fantastic meal, cod and chips, carried out (12)
I believe the answer is:
accomplished
'carried out' is the definition.
'fantastic meal cod and chips' is the wordplay.
'fantastic' indicates anagramming the letters.
'and' says to put letters next to each other (I've seen this in other clues).
'meal'+'cod'='mealcod'
'mealcod' put after 'chips' is 'chipsmealcod'.
'chipsmealcod' with letters rearranged gives 'ACCOMPLISHED'.
(Other definitions for accomplished that I've seen before include "Done - with a high degree of skill" , "Highly skilled" , "Completed; skilful" , "Skilled; done" , "Consummate" .)