Party near American university site (6)
I believe the answer is:
campus
'university site' is the definition.
(I've seen this before)
'party near american' is the wordplay.
'party' becomes 'camp' (both can mean a group of people).
'near' says to put letters next to each other.
'american' becomes 'us'.
'camp'+'us'='CAMPUS'
(Other definitions for campus that I've seen before include "University buildings and grounds" , "University or college site" , "Area around a university" , "University premises" , "academic haunt" .)