I hope these pictures may be more informative. As you can see, the clip is holding the refill tube suspended above the lip of the overflow tube. The water level (as adjusted by the plumber) comes right to the top of the tube, but we didn't Observe anything pouring over the lip.
Understand that this is not a diy project, the plumber has been called several times. During the last visit he looked and thought and said that either the black gasket at the base below the flapper or the white plastic piece that rises through it might have a slight crack
but it was unlikely that those parts are available anymore and we will need a new toilet. Soooooo, I'm trying to identify the toilet in order to go to plumbing supply and see if these parts can be had. The sound heard is like a mini-flush. Numbers we can read stamped inside appear to be 367 and 1698 and inside the lid 1658 and 298, hope this helps.
BTW, my son lives in Magnolia...
Thank you for your help, it's very kind of you!
Mark