Bachelor, say, argued at party (8)
I believe the answer is:
graduate
'bachelor' is the definition.
(thesaurus)
'argued at party' is the wordplay.
'party' indicates anagramming the letters (I've seen 'parties' mean this (the letters move or party around)).
'argued'+'at'='arguedat'
'arguedat' is an anagram of 'GRADUATE'.
'say' is the link.
(Other definitions for graduate that I've seen before include "Move to the next stage" , "BA, for example" , "Alumnus of a college" , "Recipient of degree" , "Person with a college degree" .)