Entrance to building vast at the front, see, and built badly (9)
I believe the answer is:
vestibule
'entrance' is the definition.
(thesaurus)
'vast at the front see and built badly' is the wordplay.
'at the front' suggests taking the first letters.
'and' says to put letters next to each other.
'badly' is an anagram indicator (letters in the wrong order).
The first letter of 'vast' is 'v'.
'see' put after 'built' is 'builtsee'.
'builtsee' is an anagram of 'estibule'.
'v'+'estibule'='VESTIBULE'
'to building' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for vestibule that I've seen before include "reception" , "room" , "Antechamber, hall" , "part of house" , "Entrance hall - foyer" .)