My motor just got worked on this past weekend as I had white smoke coming from the exhaust plus a knocking sound. I'm not getting any smoke coming from the exhaust but after running my car for a little bit the knocking sound came back and now i am unable to change gears after starting the car. When I rev the motor i can see white smoke coming from under the block and i can also a hear a crackling sound.... i think it is the clutch but i have no clue

any help will be welcomed
thanx