Shouldn't need a clarifier with a 2x lens. You may want to check what they run for classes and the rules. A lot of places a lens in the scope puts you into an Open class. There is a place I've gone to in the past that has a MBR-O (Bowhunter release optics) that allows you to use a lens and/or movable sight, but limits the stab. 2x isn't much, and if you want to shoot bowhunter class it wouldn't be worth trying to use (or spending money on).