Need help .

10.Can players and clan leaders leave a clan at any time?
• All clan members have the option to leave a clan at any time. If the leader of a clan leaves, then clan ownership/management will be automatically transferred to that clan’s lieutenant that has the highest clan point contribution.


11.If a clan leader is AFK or Banned for a long period of time can the leadership be transferred?
• A clan leader who is away from the game and has not logged in after 60 days will no longer be considered an active Clan Leader. At this point the clan lieutenants, or highest ranking member if no lieutenants are in the clan, may then contact us, we will attempt to contact the leader through a support ticket to confirm they have quit. If no response has been give within 7 days then leadership can then be transferred to the highest ranking lieutenant. In the event that the clan leader is banned, then after 60 days the clan lieutenants, or highest ranking member in clans without lieutenants, may contact us to have the leadership transferred to the highest ranking lieutenant. In either case this can only be done after at least 60 days of the clan leader having quit or being banned.

This has all taken from the Clan FAQ. Basically, you will have to wait 60 days unless you can get the leader to leave and appoint another in their place.