A social event creating fuss (3)
I believe the answer is:
ado
'fuss' is the definition.
('ado' can be a synonym of 'fuss')
'a social event' is the wordplay.
'social event' becomes 'do' (do is a kind of social event).
'a'+'do'='ADO'
'creating' acts as a link.
(Other definitions for ado that I've seen before include "flapping" , "hoo-hah" , "Goings-on" , "excitement" , "Fuss, trouble" .)