A club is a venue you usually have to pay to enter (almost always entry fee per event, not a year's membership). An assortment of DJs are booked to play, usually selected on account of the rough similarity of their music (ie., techno, funky house, R&B etc.)
Something you join if you like a lot of chocolate on your biscuit. Also the name of said biscuit.
Failing that, it's one of these:
A finger of fudge is just enough to give your kids a treat!
Is a disco also a club?