Crossing place for bull at university (6)
I believe the answer is:
oxford
'university' is the definition.
(I know that Oxford is a university)
'crossing place for bull' is the wordplay.
'crossing place' becomes 'ford' (I've seen this in another clue).
'for' says to put letters next to each other (I've seen this in other clues).
'bull' becomes 'ox'.
'ford' put after 'ox' is 'OXFORD'.
'at' acts as a link.
(Other definitions for oxford that I've seen before include "River in Newcastle" , "English university on Thames" , "Where one may view St John's" , "city producing different make" , "Material used in shirt" .)