Vestibule (4)
'vestibule' is the definition.
(synonyms)
This is the entire 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" .)