As always, correct me if I'm wrong guys. Take my advice with a grain of salt, as I just started this boxing stuff. Just learned this one tonight though, so I figured I'd throw it out there.

When clinched in tight, look for the opening to throw the right uppercut. Follow up quickly with the left hook and right cross. Spent some of my time sparring tonight trying to work on this combo, and I can see how it would work well.