Accept

This command is used to admit another player character into a clan.

From "help accept:"

Accept:

The accept command is used for accepting new members into your clan. This
command may only be used by the Leader or the Advisor of the clan. The syntax
for accept is:

accept <character name>

To remove someone from your clan or to leave a clan see 'help outcast'. See
'help clan' for more information about clans in general.