Left out, possibly a social misfit (4)
I believe the answer is:
lout
'a social misfit' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'left out' is the wordplay.
'left' becomes 'l' (common abbreviation).
'l'+'out'='LOUT'
'possibly' is the link.
Can you help me to learn more?
(Other definitions for lout that I've seen before include "A noisy badly-behaved fellow" , "disrespectful person" , "Yobbo" , "Yahoo" , "Awkward and stupid person" .)