of, pertaining to, or characteristic of a clan.

inclined to associate exclusively with the members of one's own group; cliquish

the clannish behavior of the original members of the country club.

imbued with or influenced by the sentiments, prejudices, or the like, of a clan.

adjective

friendly , open , welcoming

adjective

akin , alike , associative , cliquish , close , insular , like , narrow , related , reserved , restricting , restrictive , sectarian , unfriendly , unreceptive , exclusive , secret , select , united