I have a Large Condi, and a large maroon 3 stripe clown. it took a while but the anemone started hosting the clown. The clown did go through a period of being swollen, and lethargic , like an allergic reaction, but now they get along great, the clown fish recently started bringing the anemone food scraps. In hind sight Condylactis is a poor choice for a reef aquarium, it is aggressive and tend to move around, requiring that other corals be moved on occasion. considering a Condylactis anemone and a clown fish are from different regions, it is possible that the anemone ate or killed your clown. watch for an algae bloom, or check your ORP if you monitor it. hopefully he is just acclimating to the stings and will reappear.