Clan's chief incapacited and politics
A common problem with clans, is when the chief stops playing without choosing someone to succeed him.
A good solution to this problem, would be to setup a political system. When a chiefs creates a clan, he might choose a political structure, which would define the procedure to replace him.
For an example, it might be by fighting a challenger, or by an election, or even something else. The fun part would be that it is the chief himself which choose the active system, but the rule should not make possible to block the possibility of a political revolution.