Social outcast is a bit of a people person (5)
I believe the answer is:
leper
'social outcast' is the definition.
(thesaurus)
'bit of a people person' is the wordplay.
'bit of' indicates the answer is hidden within the clue.
'LEPER' can be found hidden inside 'people person'.
'is a' is the link.
(Other definitions for leper that I've seen before include "This person unwanted by society" , "Undesirable" , "Person shunned socially" , "Sufferer from dread disease, once made to wear bell" , "Someone shunned" .)