That is all a clan gives you technically, but of course clan-mates play together etc. It varies from clan to clan whet extra they do.
Ska, I like to think that a clan gives you what you make of it. Additionally if you were to join a clan you'd still have good players who won't get booted I can join in games or make them with good players
+ whatever the clan offers you (this I believe can vary by a lot).