Friar's food? (4)
I believe the answer is:
tuck
I believe this clue is a double definition.
'friar's' is the first definition.
(Friar Tuck)
'food?' is the second definition.
(tuck can mean food)
(Other definitions for tuck that I've seen before include "goes with a nip?" , "Food (colloq)" , "Friar friend of Robin Hood - to gather - food" , "Eats" , "Position for diving" .)