i am quite sure the majority of the problems we have in the left side defensively, is because lack of defensive work from the midfielders. david silva isn't tracking back besides from the first high pressure when we just lost the ball (but he is the best at the high-pressure though), and fernandinho or yaya isnt helping, so its almost a 1-1 situation everytime which in he is ok, but as soon as the opponents right back is coming forward, he is in a 1-2 which he of course cant handle.
the problem may have looked worse yesterday without Kompany, who is good at helping out in the wide areas, but garcia and Nastasic rarely do so. The solution should be to push nastasic further to the left when he sees it coming, and for richards/zabaleta to go closer to the centre to help dealing with the posible cross. That said David Silva, should mark his own man (their right back) and the central midfielders are definetely supposed to help out as well.
That being said, Clichy has regressed in form during the last 6 months, but he doesnt deserve to take the blame alone.