The food processor is a wonderful tool to make pie crust, but you have to be careful to handle ithe dough very little.
Make sure the fat you are using is ice cold and cut into small bits. The water should be icy cold, too.
When you combine the flour, salt, water and fat, quickly pulse the processor ON and OFF until the ingredients resemble small peas.
Then, take the "dough" out and gently gather it together until it holds together. The key is to handle it as little as possible.
Pat it into a disk, wrap in plastic wrap and chill thoroughly before rolling.
"As a girl I had zero interest in the stove." - Julia Child
This is real inspiration. Look what Julia became!