Clan Wars - simple solution
I have seen many great ideas about how to implement clan wars. The problem is they are so out of the box Supercell would need to make major changes to the game. My suggestion below would take little programming and satisfy what we are all longing for.
1) Have an option button to search for a specific clan to battle or you can have the game find one like we do now
2) both sides have to approve the war
3) The first clan to reach 1000 (or some other #) trophies against each other wins the war
4) a war chat room so both enemies can banter with each other
5) keep clans win/loss record with war history for others to see.
This is a simple change. Keeps how the game is currently setup and gives us what we want.