I've loked into this a bit now, and it seems you're right - the clearing agents bind the dead yeast together and make it all sink to the bottom of the brewing vessel. The cleared beer/wine is then siphoned off. So there's no actual animal product in the stuff you drink (unless it's wine with dried blood added). Still, morally it has to count - I'm sure the animal whose guts and bones are used is just as dead whether or not we metabolise the product or not.
This is indeed pretty much the same deal as much of organic farming where bone, blood and fish meal is used. Some farmers are going over to 'veganic' production, using no animal produce.
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