Any clown that typically has a bar can have misbar babies. We need to know the species of clown so that we can tell you what the natural host is. There is no such clown with the common name "black clownfish". Could be black occi, Darwin, black saddleback, black snowflake, even mocha or Onyx or Black Photon, etc. etc.
That all said, you're most likely talking about either an Ocellaris or Percula, so what ocellaris123 said is correct in terms of the natural host, plus Heteractis crispa for percs.