If there is someone in your clan who is very annoying and creating problems for your other fellow clan mates you can remove them from your clan which is called Declan. It is very good to have a clean gentle clan for you and your clanmates as well but as like the other side of a coin, it also has disadvantages which are it makes your clan a little weak which is very dangerous for a fight and do missions. Because some missions required a certain number of clans and to win a fight a good number of clans is very much important.