The title says most of it — if memory serves, it is a clip of a British aristocrat-type in her parlor talking to a magician of sorts. The topic of hypnosis comes up, and she agrees to try it. It seems to be working, but they are interrupted. It might be from a Masterpiece Theatre-style period drama detective series, but that is just a guess. I have been scouring the popular collections, but I have yet to find it.
Thanks in advance.