It's a little bit confusing, but "console clear" is typed at the developer toolbar, not from within the console. The dev toolbar could hook into multiple thing

It's a little bit confusing, but "console clear" is typed at the developer toolbar, not from within the console. The dev toolbar could hook into multiple things you'd want to clear, so that's why it's 'namespaced' that way. You can just type clear() if you're focused on the webconsole.