Allow clan memebrs to attack each other with penalty or gain.
This is somewhat similar to a prior post that I think was titled battle simulator or dueling mode. How ever I am suggesting that clan members have a mode or feature that would allow attacks on one another to test there offense and defense. Allowing this with free troops or reduced cost and faster generation would let weaker lower level clan members refine there skills and get feedback from the members base that was attacked. Plus it would be a blast in my opinion to taunt and level clanmates.
Person could max storages and collectors. put them all outside for a friend to take if you can gain. There would have to be no loot if its against friends and clan members.