Barbarian in crowd outside university (4)
I believe the answer is:
lout
'barbarian' is the definition.
(thesaurus)
'crowd outside university' is the wordplay.
'crowd' becomes 'lot' (I've seen this in other clues).
'outside' is an insertion indicator.
'university' becomes 'u'.
'lot' placed around 'u' is 'LOUT'.
'in' acts as a link.
(Other definitions for lout that I've seen before include "Yob" , "Oaf, hooligan" , "Together" , "A coarse ill-mannered fellow" , "'Buffoon, oaf (4)'" .)