University grounds affected our group (6)
I believe the answer is:
campus
'university grounds' is the definition.
(I've seen this before)
'affected our group' is the wordplay.
'affected' becomes 'camp' (camp can mean exaggerated or affected).
'our group' becomes 'us'.
'camp'+'us'='CAMPUS'
(Other definitions for campus that I've seen before include "Higher education sector" , "Pre-planned college layout and grounds" , "educational grounds" , "In study area" , "educational location" .)