It’s fair to say that when Philippe Clement came into Rangers, improving the club’s set-pieces was low down on a list of priorities. After all, the Belgian manager was walking into a dressing room devoid of confidence and a club lacking leadership from the pitch to the stands. In a short period of time since taking the reins in October, Clement has steadied the ship at Rangers and has the club very much in the hunt for the most unexpected of trebles. But as injuries begin to relent and the dust begins to settle, the Rangers boss admits that the club’s training focus has been on fine tuning the…