In-crowd (6)
I believe the answer is:
clique
'in-crowd' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for clique that I've seen before include "Group of friends" , "Close-knit group of people who don't encourage outsiders" , "Exclusive group of people" , "'Exclusive circle of people, hostile to outsiders (6)'" , "Close-knit exclusive group" .)