Nobody can answer a question without details.
So lets answer the question as you "suggest".
Yes. the clown will probably host after you bring it home...
Until...
1) The anemone dies due to lack of lighting, or one of your other two sting it to death.
2) One of your other clowns attacks and kills the one you will be adding. It may not happen when you add it, but it will happen...unless of course they make babies.
(yeah right)
You see Hiddenicon, there is a reason that your post count stays numbered and your past questions stay on record. It is so that we have some idea of what is going on in your tank without you havening to repeat yourself. Usually that is an advantage... In your case though, the system has worked against you.
I know you hate me, I just can't figure out why.:notsure: