hello there!
A clan is a group of players who play under the same tag or name.
It works like this, a player creates a clan and chooses a name. Then players join the clan via invitation or application. Members use the clan tag in their usernames to represent for their club (Ex. [ACE] Player). The clan works together, practices together, shares tracks, and competes in events.

In shorter terms, a clan is like a sports team where you join, represent, compete together, and help the clan become stronger. (obviously)