I got an anenome in that shape when I got my mated maroon clowns. I'm happy to say that after some nerve racking weeks it came back to normal and is doing excellent. I'll try to post some pics tomorrow.
Not in the best health but good enough if you have proper light, food and environment. It should be back in greatest shape soon. By the time you got it, make sure it's tentacles are not limping and the disc is puffy, not sacking, too.