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.
clannish loyalty
clandestine
clang
clangor
clangorous
clank
clannish
clansman
clap
clapboard
clapper
clapperclaw