Everyman getting a large repast (4)
I believe the answer is:
meal
'repast' is the definition.
(I know that repast can be written as meal)
'everyman getting a large' is the wordplay.
'everyman' becomes 'me' (where the crossword setter is 'Everyman').
'getting' is a charade indicator (letters next to each other).
'large' becomes 'L' (eg in clothes sizes).
'me'+'a'+'l'='MEAL'
(Other definitions for meal that I've seen before include "Food ground up" , "Breakfast, lunch or dinner" , "Meat and two veg plus dessert, perhaps" , "Supper, e.g." , "Powdered grain for dinner say" .)