At university, group gets troubled (5)
I believe the answer is:
upset
'troubled' is the definition.
(similar in meaning)
'at university group' is the wordplay.
'at university' becomes 'up' ('up' can mean studying at university).
'group' becomes 'set' (both can mean a collection).
'up'+'set'='UPSET'
'gets' is the link.
(Other definitions for upset that I've seen before include "Overturn - perturbed - disordered" , "unexpectedly beaten?" , "thrown?" , "Knock over; worried" , "Disturbed or overturned" .)