On the Delegated Administration page, unconditional Super Administrators can delete any roles that have become obsolete.

Deleting a role also removes all clients that the role's administrators have added to the Clients page. After the role is deleted, if those clients belong to any networks, groups, or domains managed by other roles, they are governed by the appropriate policy applied in those roles (see Enforcement order). Otherwise, they are governed by the Super Administrator's Default policy.