As an Olympic Weightlifting Coach could I give my two cents worth.
With a weight in the squat racks about what the photo shows. 60kg no lighter.
Stand in front of the weight with your grip about one inch wider than your clean grip. Now move into the position as if you were going to do a back squat.
Keep the weight on the racks at all time. Now bring up your elbows as high as you can while keeping the weight on the back off the Traps. Get someone to push them up in the PNF movement.
Do this about three times at a time.
Then bring the hands closer about 1/2 inch for another set. Do this until you are one inch closer than your clean grip. Your elbows will come up in no time.
Also remember yoe have to bring your elbows up really fast when you are cleaning
Hope this helps,