A fanzine put out by (and usually for) members of an sf club. It can be anything from a simple meeting notice to a full-fledged general circulation fanzine, though they are commonly genzines or newszines. The very first fanzines — The Comet and The Planet — were clubzines.
Today, they have mostly been replaced by websites and email blasts.
On occasion, particularly if they evolve from a simple club bulletin to a general circulation fanzine, they've become independent of the club. For example, when CSFS members said the Bulletin of the Cleveland Science Fantasy Society resembled a personalzine more closely than a club bulletin, Harlan Ellison, its editor, continued the numbering but changed the title to Science Fantasy Bulletin and later yet to Dimensions.
When Seattle's The Nameless Ones' club bulletin, Cry of the Nameless, began publishing more general material, the various editors began paying the publishing costs to make it their own and eventually dropped "of the Nameless" from the title.