yes, they will host clowns. Sebae clowns among others
They aren't very hardy. Bubble tip anemones are a better choice and will host a wide variety of clowns.
What kind of clowns do you have/want? And give some details about your tank... size, lights, age etc.
They may host a clown, but the clown better be careful ! I recently say my Sebae refus a silverside (it's always a hog)...soon to see it "toss" out a hermit crab from its digestive system !