Hey friend. It's probably best that you take the advice that is being offered to you here. As others have said, "can" and "should" aren't the same. Besides the most pressing issue of the tank size for the Clownfish, I would also reconsider the tank size for you, too.
Based on your previous comments, it sounds like maybe you have a background in freshwater and are new to saltwater. Let me emphasize that these two types of fishkeeping are very different, and smaller does not equal easier to manage in the saltwater world. Some would state that it is actually the opposite. Smaller tanks can tend to have more dramatic parameter swings and crash faster than bigger ones. Coming from someone who started this hobby with a nano, I would go for something bigger. You may save yourself some grief with tank management and have your clownfish guilt-free (I hope).
My suggestion is that you hang out here a little longer before you decide on a tank or fish. If you are willing to learn, you will certainly learn how to keep and manage a beautiful and clownfish-friendly aquarium in time. The beauty of saltwater tanks can make it difficult to be patient, but tanks don't stay beautiful for long without it. Good luck. :)