Food for a friar (4)
I believe the answer is:
tuck
I believe this clue is a double definition.
'food' is the first definition.
(tuck can mean food)
'friar' is the second definition.
(Friar Tuck)
'for a' acts as a link.
(Other definitions for tuck that I've seen before include "Food (colloq)" , "Fold - friar!" , "Fold - grub" , "Eats" , "Position for diving" .)