Pater's cooked a meal (6)
I believe the answer is:
repast
'a meal' is the definition.
('repast' can be a synonym of 'meal')
'pater's cooked' is the wordplay.
'cooked' indicates an anagram.
'paters' with letters rearranged gives 'REPAST'.
(Other definitions for repast that I've seen before include "Banquet" , "Feast, meal" , "Food - tapers (anag)" , "Something to eat" , "A formal sort of meal" .)