At first, frankincense, a candle, liturgy / song. Always attention and invitation. Be sure to negotiate any increases. You get to negotiate and say no, because, well, you just get to.
My 2 cents here.
After contact and you"bring him down" (or up, ha!) 'your' Claunech will have a ghost body partially made of your "soul" what you are like, the material of the ritual, the liturgy (the words said) - and the culture you are in. So after solid contact is made, just ask him. It will be your personal gnosis, but that is also the point here.
Mine likes coffee and cigars. But that is also me, based on my background. Fellow GV magician Jake Stratton-Kent had relationship with a spirt from my maternal culture, the Mexican death saint, Santissima Muerte. He said he once asked her why she likes to be given - I forget what it was exactly... British lager (?) - and not tequila. She replied, "Because you're not Mexican."
The bigger point being, your Clauneck is "your" Clauneck. All the spirits will be, as I sometimes half-joke, 50% you. Sometimes less, sometimes more. In some Vodou houses and some Folk Catholic New Wold traditions the name "Clauneck," like all the daemons, are more an office, and many spirits can use them. Daemon names are seen here to function as offices or titles rather than singular entities. Each office is 'staffed' by a vast host of spirits and thought-beings who share that specific function, hierarchy, and frequency (pattern or "vibe"). As long as they act like the story you are using, as Clauneck, then all good.
In Espiritismo Cruzado, when a practitioner prays at the statue of St. Michael, they are calling upon the corredor -meaning the corridor/frequency / virtue - of St. Michael. The actual spirit answering the prayer might be a localized guardian spirit, a high ancestral guide, or a localized angelic intelligence assigned to that saint's "department" to deliver the requested work.
Whatever the "really-real" case, provisionally accepting this idea can avoid people quibbling and fight for their local manifestations as the singular, 'capital-T' "Truth." Accepting the "spirit office" model resolves most of these tiresome dogmatic disputes in spiritual work, when practitioners declare their localized experience are all the entities' "true nature. "