Ring house to accommodate a student (4)
I believe the answer is:
halo
'ring' is the definition.
(I've seen this before)
'house to accommodate a student' is the wordplay.
'house' becomes 'ho' (abbreviation for house).
'to accommodate' indicates putting letters inside.
'student' becomes 'l' (as in L-plates for learner drivers).
'a'+'l'='al'
'ho' placed around 'al' is 'HALO'.
(Other definitions for halo that I've seen before include "Saintly ring" , "Sign of a saint" , "Angelic aura" , "Holy ring" , "Saint's circle of light" .)