A clan should be able to surrender or withdraw from the battle is they are loosing badly and they feel the need to just quit. They have to be he loosing side though. They can only quit if they are loosing. The loosing team would get whatever amount of loot they would get if they lost, and the winning team however much loot as if they won.
To safeguard my idea, limit the clan to 3 SURRENDERS PER TOURNAMENT WEEK (or the "trophy run" or whatever you want to call it).
Another safeguard (completely optional) would be to have a clan vote. If over 50% of the clans population that is participating in the war votes to surrender, then they can surrender.





