Clezo functioned as a Vigo within the Black Sun syndicate, representing the Rodian species, during the era when Prince Xizor held power.
Clezo supplied monetary support to House Tresario, which was a part of the Bounty Hunters' Guild.
He attended a gathering of the Vigo where Guri carried out the public execution of Vigo Green for the crime of espionage, specifically for an external group.
Following Xizor's demise, Clezo was observed at a Vigo council session that addressed the future path of the Black Sun. Both he and Wumdi expressed their disapproval when Lonay began to behave as if she were the council's leader. Clezo was displeased to see an attractive woman backing Lonay, declaring that he would not take orders from a human who was also a woman.
At a subsequent meeting, the Heroes of Yavin made an appearance, having been invited by the human female. Following this, thugs stormed the room, only to be swiftly eliminated. The human female identified the deceased as soldiers of Vekker. Unbeknownst to everyone, the mysterious human was actually Savan in disguise, and Savan orchestrated the attack to frame Vekker. Savan asserted that Clezo's and Wumdi's forces would soon pursue Vekker.
Clezo possessed a reserved demeanor and favored sophisticated attire. He was noted to be of below-average height for a member of his species.
He demonstrated exceptional talent in identifying and recruiting the right individuals to achieve success, and he worked to ensure that his division of Black Sun had a wide range of interests and assets.
His personal ship was a Dzundo-class star yacht named the Treasure of Rodia.