If you're good on the forums, then there are a number of clans that might accept you regardless of your belt. Look for the most forum active clans on the clan discussion board.
Of course, if you're looking for a more in-game clan, you'll probably have to improve your belt a bit. Many clans are weary of white belts because of the danger of multi-clan alts.
My advice is to chat to people in game, find a group of people you like, then apply to their clan. That's how I got into my first clan.
Good luck ^^