I tried the other method of drawing a line over an object I want clipped. I then select the object, the shift select the other object. I then select Object > Path to stroke. I then select Object > Clip > Set. But it leaves the line I drew, not the other line I want clipped. I have tried lowering my line to the bottom but still no luck.

How to do this very simple task? I'm confused why I can't just erase it.
Thank you in advance