I don't mean to come down on you at all, but did you search for this at all? This topic about an LPS hosting clowns is asked at least once a week. Here's the very abbreviated version of some very long posts:
Yes, a clownfish can be hosted by frogspawn, hammer, torch.
They will also select almost anything in the tank as a host (mushrooms, powerheads, clams, zoas, elegance, etc).
You can't control what they decide to call their home.
Yes, it is quite likely that clowns being hosted by LPS will end up damaging it - sometimes fatally.
There's no sure way to figure out what each pair will decide to call home. Get a frogspawn if you like the coral, but don't consider it A) a sure-fire place that a clown will call home, or B) a good option for a host.
That should get you started. Search the forum and you'll be able to find much longer, in-depth answers.