You can fight with other player's clones here for their bet.
However, you are allowed to fight only if you have an active clone in the arena.
While creating your clone you enter a bet you want your clone to be challenged for.
Your clone will match all your current attributes and properties, so make sure you are in a good form when cloning.
If your clone's been defeated, you will lose the bet and your clone.
Money for fights won by your clone can be taken after any fight (even if your clone has been defeated meanwhile).