Food provider (5)
(Other definitions for baker that I've seen before include "His dozen is 13" , "One who makes bread" , "Maker of cakes/bread" , "Producer of bread/cakes" , "Bread and cake maker" .)
'food provider' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for caterer that I've seen before include "One supplying cheer" , "Refreshment supplier" , "Food and drink supplier" , "One supplies" , "Someone needed for party" .)