Clan war within clan( URGENT)

Me and my clan mates all go to school together and we always want to attack each other's bases, but we can't. There should be a clan war within the clan ability so that you can attack your friends, but you don't loose trophies, the troops trained, and you don't gain loot. If that Idea doesn't work you should be able to search a friend and be able to attack him without gaining or loosing anything. Thank you

I like this idea, but it's been suggested that players can copy enemy bases during war and practice their attacks using this method.

Sounds like a practice attack like modding eh?