Sorry to hear about your losses, getting started can be frustrating. My guess would be that the clown died and the condy happened to grab it. Carpet anemones are known to catch fish, but condy's aren't nearly as aggressive, they just aren't good hosts for clowns. Bubble tips and Long Tentacle Anemones (LTA) are the preferred ones if you have other fish in the tank.
We all learn the hard way not to trust all fish store employees. Figure out what you want to buy before going shopping, keep a list of "compatible" fish and corals, and then you can avoid the temptation about buying something you don't know about or that could be incompatible. Build trust with you local fish store employees by verifying what they tell you BEFORE you buy. I could have saved quite a bit of $$$ and fish lives over the last few years.