From Longman Dictionary of Contemporary Englishclubbyclub‧by /ˈklʌbi/ adjective informal a clubby place is where everyone is very friendly to each other, but people who are outside their group are not very welcome the clubby atmosphere of the media
Examples from the Corpus
clubby• The result is a clubby feel.• The Pueblo peoples were a chubby and clubby lot.• In other words, many of the snobby, clubby vibes that tend to waft around conventional classical music are absent. 