Redecorate at university after party (2,2)
I believe the answer is:
do up
'redecorate' is the definition.
(I've seen this before)
'at university after party' is the wordplay.
'at university' becomes 'up'.
'after' says to put letters next to each other.
'party' becomes 'do' (do is a kind of party).
'up' put after 'do' is 'DO-UP'.
(Other definitions for do up that I've seen before include "Redecorate" , "Renovate - fasten" .)