Pour pan drippings into a fat strainer; let stand until fat rises to top. Pour 1 3/4 cups turkey broth into a liquid measuring cup; reserve 2 tablespoons fat from drippings. Heat reserved fat in bottom of heavy-duty roasting pan. Whisk in flour, and cook 5 minutes, whisking to loosen particles from bottom of pan. Gradually whisk in reserved turkey broth, and cook, whisking constantly, 10 minutes or until slightly thickened. Serve immediately with turkey.