Be taking Italian at university - enjoy oneself (4,2,2)
I believe the answer is:
live it up
'enjoy oneself' is the definition.
('live it up' can be a synonym of 'enjoy oneself')
'be taking italian at university' is the wordplay.
'be' becomes 'live' (living is a kind of being).
'taking' says to put letters next to each other.
'italian' becomes 'it'.
'at university' becomes 'up'.
'live'+'it'+'up'='LIVE IT UP'
(Other definitions for live it up that I've seen before include "Go on a spree" , "paint the town red" , "Enjoy oneself" .)