I am confused how to clean air filter in WagonR.

The manual has above figure. I can easily open the upper two clips. But the bottom one shows another clip and in reality there's no third clip. Instead there's a rubber and oil check stick in place of third clip. I tried removing the rubber but it's too hard so I stopped and thought better confirm it before removing the cover under which the air filter resides.
Any idea how to properly remove it?