Clarity in available in both Lightroom, ACR and Photoshop with the Camera Raw filter. What it does is increase contrast in the midtones while leaving the contrast alone in the highlights and shadows. When you drag the slider to the right thinks like type begin to pop. One thing I like to do when shooting beauty is drag the slider to the left. It begins to lower the contrast in the midtones while leaving the highlight and shadows alone and makes for a softer look while keeping details just fine. Try it. It's just fun.