Vestibule (5)
'vestibule' is the definition.
(I know that vestibule can be written as hall)
This is all the clue.
(Other definitions for hall that I've seen before include "Large country house" , "Large public building" , "Large house (linked to Dotheboys, Wildfell and Toad)" , "Foyer" , "Toad ___ (Toad's home)" .)
(Other definitions for porch that I've seen before include "Roofed entrance to house" , "Veranda" , "Covered entrance to house" , "Sheltered entrance" , "Protection over a doorway" .)