You want my star tip of the day?
Use the "New Clans" board to get members.
You need a spare level 10 to create clans.
You create a clan with the URL of the ACTUAL clan you want to promote in the clan name.
Create the clan. Then join a level 1 guy to the clan (called something like "<<< JOIN THAT CLAN!" to attract attention), remove the level 10 and create several similar clans until you have spammed the board with clans with the URL name of your ACTUAL clan in it.
has worked for me .... twice.
Add something like "LV10+" to the spam name when you want higher up guys.
Remove the lv1 guys (you want to keep them if you manage to create one with a good advertising name ... I have several!) and let the spam clans die .... repeat .... again .... and again ..... etc etc ....
Yes, you'll still get a lot of lv1/2/3 but with decent spamming and a bit of patience, you'll have a ranked clan in no time.