Tucking or pulling your right elbow down during the downswing causes your left elbow to move away from your body, creating an angle that leads to a slice
Allow the butt of the club to stop at impact while the clubhead continue to the finish in order to create the spin necessary to make the ball check up after a couple of bounces
In order to swing the club around your body in a one plane swing you will have to bend over more and stand further away from the ball.