Restrict spy's during WAR
Every clan would like to start war and wish to win always. All those clans don't have the 50 people. So they will recruit people always. It makes the enemy clan to go for a cheap idea. That is the clan member will leave the clan and join the enemy clan and take take screenshots of all the bases and join back their own clan. So they can see all the traps and plan their attacks with respect to the bases.
So, there is an idea to restrict them. If a person joining a clan while preparation or war day HE/SHE SHOULD BE RESTRICTED TO TAP CLAN WAR BUTTON UNTIL THE CURRENT WAR gets finished. It could be helpful to restrict the spy's.