Ally Clan

Probably not only I have been wanting it.

To make it realistic and not spoiling the game:

Administrator:
Ally Clan(s) can have the same or not the same leader
Co-ld, Elder, member can only in one clan

Chat box:
Ally Clan(s) share the same chat box
Each clan has their own private chat box in another window but with less conversations that can stay (to reduce usage of Supercell's hard drive)
Ally Clan(s) member's name in another color
Replay share in chat box is viewable to also ally clan(s) members

Donation:
Only the same clan members can see each other's troop request and can donate

War:
Ally Clan(s) can't participate each other's wars but they can always watch war logs and watch live.


So basically only leader can be in more than one clan and, only war log and chat box text is shared to ally clans. Other thing that could literally change the game like donation, stay the same as it is now.