Antisocial person (5)
I believe the answer is:
loner
'antisocial person' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for loner that I've seen before include "One liking solitude" , "One shunning company" , "He's not a joiner" , "One not desiring companionship" , "One lacking friends" .)