Behave as we do after ignoring University opening (7)
I believe the answer is:
doorway
'opening' is the definition.
(I've seen this before)
'behave as we do after ignoring university' is the wordplay.
I cannot quite see how this works, but
'do' is found in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for doorway that I've seen before include "Opening" , "Room access, threshold" , "Threshold, portal" , "Entrance to a room" .)