Hi - I was just writing a reply to second this feature request but I found a way to make it work in my case. I clicked on the clipped content and at the top of the selection, the HTML Layout area, I clicked the three dots ... and there was an option for simplified formatting. After I clicked that, I was able to select and delete images.
I apologize for posting this in the incorrect area, but this was the first results for "evernote remove image from web clip" and I wanted to disseminate my find as much as possible. Thanks.