This is kind of mean. When I started playing, I found a great clan but after a few weeks someone had supposedly earned our owner's trust kicked everyone and basically destroyed our clan. What if when you started playing someone did that? You wouldnt think so strongly about anti-noob game, would you?
If I remember correctly a clan called N00BHUNTERS was created back in 2012 just for this reason of disbanding other clans by asking for ownership.
When becoming an admin in a clan, just change it slightly every day, putting stupid things in there. Change the ad to say "8m warbeasts" Give the members stupid names and watch as the clan wonders who is doing it all, meanwhile you are "undoing" the work of the bad admin. When the owner takes admin from everyone except you, follow up by kicking everyone while the owner is on vacation (hopefully a reasonable size by now) and then strip the owner and force an apology for threat of attacking his clan and him towards never growing.
Alternatively you can just frame another admin and then get your friends to farm him to apology, then when the owner tries regrowihg the clan, kick everyone and lay out your master plan in a thread, his apology thread, and that the owner was wasting his time farming the framed admin.