Exaggerate about party (6)
I believe the answer is:
overdo
'exaggerate' is the definition.
('overdo' can be a synonym of 'exaggerate')
'about party' is the wordplay.
'about' becomes 'over' (I've seen this before).
'party' becomes 'do' (do is a kind of party).
'over'+'do'='OVERDO'
(Other definitions for overdo that I've seen before include "Sum of a persons actions (Hinduism)" , "Work too much" , "Cook wrongly" , "Cook too long or act excessively" , "Take too far" .)