Combine nuts, 2 Tbsp. sugar and butter; press onto bottom of 9-inch springform pan.
Bake 10 min.
Meanwhile, beat cream cheese, 1 cup sugar and flour in large bowl with mixer until blended.
Add sour cream and liqueur; mix well.
Add eggs, 1 at a time, mixing on low speed after each just until blended.
Pour cream cheese batter over crust.
Bake 1 hour 5 min. or until center is almost set. Run knife around rim of pan to loosen cake; cool before removing rim. Refrigerate cheesecake 4 hours.