who is?

Drturtlegirl wrote:

Thomas CLEMENT - showed up as an "allowed" in the background with recent update

That is the developer of your "Time Machine Editor" app.

Apparently, he was a bit upset to learn to that Apple was going to be displaying app signing information in Ventura. I thought that tweet was one of the funniest things I had ever seen. Imagine people wanting to know who wrote the software running on their computers!

Please read the following user tip and restate your question/problem in detail: 

     Writing an Effective Apple Support Communities Question - Apple Community

Where in the background?

Can you post a screenshot of what you're seeing?