Two options:

(1) When you are on the site now

You can do it from an icon in the address bar. CXlick the lock icon at the left end of the address bar. A panel should drop and after a moment, a "Clear Cookies and Site Data" button should appear at the bottom. Go ahead and click that.

In the dialog that opens, you will see one or more matches to the current address so you can remove the site's cookies individually without affecting other sites.

(2) If you don't want to visit the site

On the Settings page, go to

Privacy & Security > Cookies and Site Data section

Use the "Manage Data" button to show a list of sites which have set cookies and you can make individual site deletions there. Make sure to Save Changes when you're done.

Does that take care of it?

See also the Storage Inspector for more info about the cookies used by the website in the current tab.

• https://developer.mozilla.org/en-US/docs/Tools/Storage_Inspector