Baker, having finished at noon, runs out (4)
I believe the answer is:
oven
'baker' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for oven that I've seen before include "Hot spot" , "Enclosed chamber for cooking" , "Kiln, cooker" , "Part of a cooker" , "A hot place" .)