New Clan War idea... Civil war!
A civil war would be played within the one clan. Two captains are selected and they choose the teams from within the members of their own clan. This civil war could last half of the time that a normal war would. So lets say that you have a 10 member clan, the two captains select 4 other members each... this leaves a civil war of 5 a side.
The way that supercell can make this would be to add another button beside the clan war button for the civil war. When you go in there it looks just like a normal war screen and you can't see your opponent's traps or clan castle troops. Seeing that this is a war between one clan do not add any extra xp for the clan or war win bonus. Civil war is just a practice war to enable the clan members to gain experience in attacking and also to test out new bases. Also inside the Civil war button you could add a chat screen for each team so members can discuss war tactics without the opponent team being able to read this.
I think this would be a great idea as it would allow members of the same clan to compete with each other. It would not be OP because no loot bonus or clan experience points will be added to the clan and a civil war only lasts half of the time of a regular war... All you gain from this is experience which is priceless. Let me know what you think about this because i would most certainly like to see this in the next update!!