Allied Clans or Clan Combination
I bet this would be big on a update, Clans Allied with at least 1 clan, There can be a tab saying Request Allied, but it can only be done by the leader and must be accepted or denied by leader to be Allied and also a possibility to remove allied and once removed allied can be requested again after 24 hours, then on the message tab it can say "Global", "clan", "Allied" we can message and donate troops to each other, By depending your clan perks are effected, for example the Allied clan is a level 2 clan and ours is level 6 and if a Player donates me a level 2 Wizard, I can recive it as level 3 because of our clan perk, but if I want to donate to the Allied a level 5 wizard, they receive it as level 5 for they are level 2 clan, My other Idea for Combination Clan is similar to Allied clans, you will see a small version of your allied clan emblem on the right above your normal clan emblem you combined with, except You can include them in wars, Spectators can donate on Preparation day, and on the War Map it shows the clan Emblem on the TH on top of it of Thier own clan, and next to their name on the War List, The Clan Emblem to know Who's in where, if you don't like the Combined clan idea, its cool at least add the Allied Clan and add the features of the Combined clan to Allied clan
Note: Clan Must be lead and control by their own clan of positions and behavior, and have the right to mute players for a certain different time, I hope you accept the idea SuperCell!