House not ever needed as college (8)
I believe the answer is:
seminary
'college' is the definition.
(college for priests)
'house not ever needed' is the wordplay.
'house' becomes 'semi' (short for semi-detached).
'not ever' becomes 'nary' (variant of 'never').
'needed' is a charade indicator (letters next to each other).
'semi'+'nary'='SEMINARY'
'as' is the link.
(Other definitions for seminary that I've seen before include "College for trainee priests" , "Religious training college" , "Training college for priests" , "Theological school" , "School of theology" .)