No they are clipped when they are intensively reared or on farms, often to prevent them pecking each other but that is because they are always kept so close to each other that they don't really have anything else to peck. The choice is just the same as cutting the tail from a horse/dog/sheep/pig... it really isn't necessary in fact I would discourage you from the practice but that is just my personal opinion and although I can see the reasons why it is done, I do not approve of it because having their full beak I think makes life a lot easier for them in the long run. If you do decide to do it or have it done make sure it is done properly as cutting it wrong could impede the chick in eating, drinking and cleaning as well as many other things.