Revolt rising for social outcast (5)
I believe the answer is:
leper
'social outcast' is the definition.
(thesaurus)
'revolt rising' is the wordplay.
'revolt' becomes 'repel' ('repel' can be a synonym of 'revolt').
'rising' is a reversal indicator (going up in a down clue).
'repel' back-to-front is 'LEPER'.
'for' is the link.
(Other definitions for leper that I've seen before include "Outcast, pariah" , "This person unwanted by society" , "He's avoided" , "Social outcast" , "Sufferer from dread disease, once made to wear bell" .)