Well, I just watched "Cry of the Werewolf" on Amazon Prime. I am pretty sure it is the one, Randy. I think the clock they kept showing on the mantle was what stuck in my mind as the face on a clock tower. I remember the secret passage, and there were some brief flashes of familiarity during some of the scenes. I can't be 100 percent sure—it was over fifty years ago that I watched it before, and not even the whole thing, because I walked into the room while someone else was watching it on the TV and I think it was near the end—but very nearly certain.
It was not a very good movie, I have to say. Not one I would recommend. But thank you for helping me find out what it was after all these years.