Clan-General was a title in the Hutt Empire. Prior to the Xim Wars, the Hutt Kossak Inijic Ar'durv was appointed as a Clan-General by the first Conclave of Worms.
Sources
Xim Week: The Despotica (Part I) on Hyperspace (article) (content obsolete and backup link not available) (First mentioned)
The Written Word on Hyperspace (article) (content obsolete and backup link not available)- The Essential Guide to Warfare