Resource sharing with in clans.
Using the clan castle, you are able to receive resources from people in your clan, but you can only receive as much as you can in war loot. The storage where your war loot is, would be where the resources from your clan go, and you can only get that much, and to keep it from being to over powered, you could only receive only type of resource at a time, and a cool down time. The cool down time could be the same as the cool down on reinforcements, and I mean the level
of the clan could boost the amount of resources you are able to receive, and lessen the time for the cool down. The could down could be an hour or something. If you have any questions feel free to reply :)