Campus buildings (5)
I believe the answer is:
halls
'campus buildings' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for halls that I've seen before include "Entrance passages" , "Lobbies" , "'I dreamt I dwelt in marble . . . . .' (song)" , "''I dreamt I dwelt in marble ...'' (The Bohemian Girl)" .)