Anybody else get angry that someone attacks the person you've been eyeing in Clan Wars? It might be by accident, even though you said 'Im going for number 8' well here is the answer:
WAR MARKERS:
War Markers let your clan mates know that you are going to attack that certain player that you set a marker on, sadly I don't have any pictures to show, but I think if your reading you can get the picture. A little flag maybe to signify that someone wants to attack that player when war starts, maybe even blocking someone else from attacking that person.
Blocking other attacks is a bad idea. What happens if someone tags a base and then does not use their attack?
Maybe make flags removable by Leader/Co-Leader?
Looking at this from the other side, how about enabling the assignment of targets by leadership? Like the flag idea, but each member can have their first attack suggested (or dictated?) to them.