Disgraceful riot soon breaking out -- university steps in (9)
I believe the answer is:
notorious
'disgraceful' is the definition.
(I've seen this before)
'riot soon breaking out university steps in' is the wordplay.
'breaking out' indicates anagramming the letters.
'university' becomes 'u'.
'steps in' is an insertion indicator.
'riot'+'soon'='riotsoon'
'riotsoon' with letters rearranged gives 'notorios'.
'notorios' placed around 'u' is 'NOTORIOUS'.
(Other definitions for notorious that I've seen before include "Disreputable - 1946 Hitchcock classic" , "Scandalous" , "Famous for bad deeds" , "Having a bad name" , "Hitchcock film" .)