Preheat oven to 350°.
In a large bowl mix together 3/4 cup grated cheese and flour. Stir in chopped turkey, diced celery, mayonnaise, 1/3 cup chopped toasted almonds, lemon juice, oregano, salt, and pepper.
On lightly floured surface, roll out dough in rectangle shape to fit 9" x 13" baking dish. Transfer dough to dish being careful not to stretch pastry. Turn under the edges, and flute to seal to dish spoon turkey mixture into pastry crust. Sprinkle with remaining grated cheddar cheese and chopped toasted almonds.
Bake 30 minutes, or until lightly browned and thoroughly heated.