When she first joined, the company had something of a high-school cliquishness, albeit in reverse.
From the businessweek.com
She alos has a polished veneer over adolescent cliquishness.
From the economist.com
I suppose I see what you mean by creating a sense of cliquishness, and will be more aware of that in the future.
From the en.wikipedia.org
The diversity of causes and interests at times made for a certain cliquishness, with union and church groups, dressed in identical T shirts, sticking together.
From the time.com
More examples
Clannishness: tendency to associate with only a select group
(cliquish) clannish: befitting or characteristic of those who incline to social exclusiveness and who rebuff the advances of people considered inferior
(cliquish) Of or pertaining to a clique; Tending to associate with a small and exclusive group