Cavorting pair later on common (11)
I believe the answer is:
proletarian
'common' is the definition.
(thesaurus)
'cavorting pair later on' is the wordplay.
'cavorting' is an anagram indicator.
'pair'+'later'+'on'='pairlateron'
'pairlateron' is an anagram of 'PROLETARIAN'.
(Other definitions for proletarian that I've seen before include "Working-class" , "Relating to the workers" , "Ordinary worker (Marxism)" , "Characteristic of the working class" .)