Don't take opportunity to succeed at university (4,2)
I believe the answer is:
pass up
'don't take opportunity' is the definition.
'succeed at university' is the wordplay.
'succeed' becomes 'pass' (passing is a kind of succeeding).
'at university' becomes 'up'.
'pass'+'up'='PASS UP'
'to' acts as a link.
(Other definitions for pass up that I've seen before include "Neglect (an opportunity)" , "Refrain from seizing (an opportunity)" , "Have nothing to do with" , "Showing neglect" , "col?" .)