This might be best addressed outside of the meeting in a one-on-one conversation with the individual on their style and how it impacts the group. Some people are not aware and getting the feedback may resolve the issue quickly. If, on the other hand, the style of the individual continues and is deemed disruptive to the group, there may be no other choice than to remove them from the circle.
For more information, check out our handbook Many Voices One Song sections 4.1-4.3