Pass with third in Geography at Cambridge University (4)
I believe the answer is:
omit
'pass' is the definition.
(thesaurus)
'third in geography at cambridge university' is the wordplay.
'third in geography' becomes 'o' (3rd letter of 'geography').
'at' is a charade indicator (letters next to each other).
'cambridge university' becomes 'MIT' (MIT in Cambridge, Massachusetts).
'o'+'mit'='OMIT'
'with' is the link.
(Other definitions for omit that I've seen before include "Fail to use" , "Fail to include" , "Neglect to include" , "Exclude; forget to include" , "by-pass" .)