Well, I suppose that depends on how you define 'clan'. I mean, Pdox games don't have much option to cooperate, so by definition you won't get a group of people who come together to kill the monsters. (Unless you count AI-bashing in the early stages, but it's hardly cooperative.) However, you do get groups of people who often play together, as in the Great Game, for example - we've played several other games as well.