Okay kiddo, imagine that you are playing a game with your friends and you want to win. But sometimes, you might not be doing everything perfectly and your friends might notice. That's similar to what happens with doctors and nurses when they work with patients. They want to do everything perfectly so their patients get better quickly.
But sometimes, they might not do everything perfectly, even though they tried their best. That's where clinical peer review comes in. Other doctors and nurses who work with the same patients look at what the doctor or nurse did and see if they could have done things better. They aren't trying to be mean or make their friend look bad - they are trying to help them improve so they can do a better job in the future.
It's like if your friends saw you weren't holding the ball correctly during your game and showed you a better way to hold it. You would learn and next time you play you would be better at it. That's all clinical peer review is - a way for doctors and nurses to learn from each other and do a better job taking care of their patients!