The long winded people...

Sometimes, the only way is to cut them off & say, "Yes or no" is sufficient. If it's someone at work, I do wonder if they did that at the interview, as it's someone I would add close to the bottom of my list of candidates, basically because someone like that would annoy the heck out of other co-workers trying to get things done or with a deadline to meet. Also, how much work does this person get done while busy giving long-winded answers instead of saying yes or no & then getting back to work? I actually cannot think of any wasy way to gently approach directly. If you really trust the confidentiality of your supervisor, maybe talk to that person. Let the supervisor handle it.