If he tries to break past you, that's all body, unless you can come up with an awesome check. That's about it for conatining. When he's shooting, get your stick as close to his as possible, and go for a check to his shaft or blocking his shot with your stick head. Body to body means, nail him. If you're close enough, giving him a good body check will always throw off his aim.
Clears are tough.
Sometimes this will make him slow down, letting you get square. If you are square and inbetween the man with the ball and the goal, stay on your toes and look for a good stick check to give him. If he gets by you, the cycle starts again. I hope this helped, good luck defending. A strong check to his open shaft will work if it's there.