Bans maybe Cornish singer going round entertaining university (7)
I believe the answer is:
outlaws
'bans' is the definition.
(I've seen this before)
'cornish singer going round entertaining university' is the wordplay.
'cornish' becomes 'SW' (Cornwall is in the South West of England).
'singer' becomes 'alto' (type of singing voice).
'going round' says the letters should be written backwards.
'entertaining' means one lot of letters goes inside another (inviting in, as for dinner).
'university' becomes 'U' (abbreviation for university).
'sw'+'alto'='swalto'
'swalto' reversed gives 'otlaws'.
'otlaws' enclosing 'u' is 'OUTLAWS'.
'maybe' acts as a link.
(Other definitions for outlaws that I've seen before include "Bandits?" , "Criminals!" , "Bans" .)