I'm not sure if this was mentioned in other replies, but if you wanted a website set up instantly, which can be easily customised for a cs clan i'd have a look at e107!
http://e107.orgIts bascially a content management system written in php, using the open source mySQL database system for content storage. It's completely free, totally customisable, and in constant development!
You can download alot of plugins to go on your site which can be found at
http://e107coders.org/ For example your clan you could have wars listed, so visiting clans can submit matches using rwar or a member of the clan enters the details, ur players can list if they are avl, leader picks the team and then the outcome of the game can be entered. i.e the scores, result, report, and links to screenshots / demos