Bake-off appliance (4)
I believe the answer is:
oven
'bake-off appliance' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oven that I've seen before include "A hot place" , "It may get very hot" , "Hot spot" , "Chamber for baking" , "Kiln, cooker" .)