You can use commands in clan chat. List of all commands:
/clean – reset your account (will keep score and clan)
/full – upgrade all buildings to max level available for your town hall
/th <level> – upgrade town hall to specified level (example: /th 13)
/asp – attack your village
/cct – remove all spells, troops and siege machines
/sethero <name> <level> – upgrade specified hero (king, queen, warden, champion or builder) to specified level (example: /sethero king 40)
/g – switch to global chat
/status – show server status (online players, used RAM and other)
/help – show all available commands