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Coups.
The ability to start a battle inside your clan's fortress in order to seize the leadership of the clan. Only members can participate, either joining the rebel(s) or defending their leader.
Obviously, not anyone can start this action. It can be limited by the requirement of a certain amount of time spent in the clan, number of battles in which you participated, ranks etc.
Customer support service by UserEcho
And what is it good for? Clans aren't formed in the game to begin with... they exist on social platforms and organize themselves there. If someone dared to overthrow the leadership in the game they would simply get kicked out of the clan on every other platform unless the clan is really into roleplaying.