And by members i didn't meant members count only, i meant levels as well, Clans will be graded according to their members levels count and members count as well, and then put up into a grade, and clans of similar grade can attack each other only, and no senseless wars would be there by this in which lvl 5000 player alone do whole job for his clan, and little level guys stay dead under him of the other clan.
It will bring balance in warring clans. And grading will ensure no strong crush weak and there will be certain range in those grades, so little bit high low levels would already be there.