Bake or grill (4)
I believe the answer is:
cook
I believe this is a double definition.
'bake' is the first definition.
(I know that bake is a more specific form of cook)
'grill' is the second definition.
(I know that grill is a more specific form of cook)
(Other definitions for cook that I've seen before include "make a pie?" , "Prepares a hot meal" , "Capt. James --, explorer" , "Doctor" , "[PILGRIM in the CANTERBURY TALES]" .)