Web Clips is the single line text that is displayed on the top of the Gmail’s mailbox. It shows you news headlines, blog posts, RSS and Atom feeds, Gmail tips, custom contents and relevant sponsored links at the top of your inbox. But seldom you see any useful clips in your Web Clips section as most of the messages that appear are just ads (sponsored links).
If you find it as annoying and if you want to get rid of these sponsored links and you want to see more of the mailbox and less of ads, you can customize and configure Web Clips so that it will only show contents from RSS feeds, news headlines that user might find it useful. Here is the way to disable and remove Web Clips.