5 ideas that may be included into the game
Clanmates' shared replay date and time
Elixir spent on armies
Clanwars streak
Clan's different townhalls number
Multi-units training tool
Clanmates' shared replay date and time
Showing the date and time in which a shared replay of a raid took place.
Elixir spent on money
Instead of spending time on a calculator calculating the cost of an army composition you have trained, an in game tool perhaps in the army camp shows you the cost of the army resting at the camp.
Clanswars streak
Ofcourse one of the most important thing most of us seek in a clan is clanwars, joining a clan that win always win clan wars is the dream of all players. Adding stats about the last couple of wars of the clan in the clan's description, and ofcourse accessible to people who haven't joined the clan yet, people already having a clan or people without a clans
Clan's different townhalls number
A feature accessible in the clan's page which shows the number of players with different townhalls. When entering the clan page a blue exclamation mark appear on the top right corner, by hitting this icon different townhall buildings level appear with the number of players having this level of townhall in the clan below.
Multi-unit training tool
Most of players, if not all are fed up from training troops each and every time you are going to attack. A multi-unit training tool that appears on the top right corner of the barracks where you can save different army compostions and just click on it to queue the troops for training. You can get up to 5 slots, the first slot is obtained at townhall lvl 3, the second at th5, the third at th lvl 7, the fourth at th lvl 9 and the fifth is bought using gems.