Etymology
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clannish (adj.)

1748, "pertaining to a clan; disposed to adhere closely to one another, imbued with prejudices, narrow or restricted in social interests and feeling," from clan + -ish. Related: Clannishly; clannishness.

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Definitions of clannish

clannish (adj.)
characteristic of a clan especially in being unified;
clannish loyalty
clannish (adj.)
befitting or characteristic of those who incline to social exclusiveness and who rebuff the advances of people considered inferior;
Synonyms: cliquish / clubby / snobbish / snobby
From wordnet.princeton.edu