There are obviously a lot of strong opinions out there, but ultimately, the choice is yours. So now that you've been told that your clown doesn't "need" an anemone, and some have tried to talk you out of getting one because it won't live for a hundred years, if you still "want" an anemone, go for it! I think they are very cool, and I am glad I didn't listen to the negative comments when I got mine.
I have a bubble tip ("quadricolor") that is thriving in my 28g reef. It is huge, and growing. I feed it squid, and supplement with an invertebrate formula, and it chows down. My tomato clown took all but 20 minutes of it being in the tank before it took to it. The thing found a spot it likes, and hasn't moved since. It fans out like a clam shell and stretches itself up higher when it needs to get more light. It is happy.
I will agree that research is important, and I am not advocating putting it in your tank without doing a little homework, but I am also not going to tell you flat out that you should not get one, because again, the choice is yours. The symbiosis between clowns and anemones depends on the type of clown and the type of anemone, so make sure you get one that your clown has a high likelihood of adopting. That research, and certainly care info is important to learn.
Have fun!