Use an oven
I believe the answer is:
'use an oven' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bake that I've seen before include "Cook ,eg, a cake" , "Cook (bread/cakes)" , "Cook (eg, cakes)" , "Oven-cook" , "Cook (cakes, etc)" .)