Graduates seen cavorting outside, all together (2,5)
I believe the answer is:
en masse
'all together' is the definition.
(I've seen this in another clue)
'graduates seen cavorting outside' is the wordplay.
'graduates' becomes 'MAs' (people with Master of Arts degrees).
'cavorting' is an anagram indicator.
'outside' means one lot of letters goes inside another.
'seen' with letters rearranged gives 'ense'.
'mas' put inside 'ense' is 'EN MASSE'.
(Other definitions for en masse that I've seen before include "Sees man (anag.)" , "All together (Fr.)" , "in concert" , "As a body (Fr.)" , "In a group U altogether" .)