clannish

adjective

1. of, relating to, or characteristic of a clan.
2. inclined to associate exclusively with the members of one’s own group; cliquish: the clannish behavior of the original members of the country club.
3. imbued with or influenced by the sentiments, prejudices, or the like, of a clan.

adjective

1. of or characteristic of a clan
2. tending to associate closely within a limited group to the exclusion of outsiders; cliquish