Clarity is a Midtone contrast adjustment. Its based on a technique of Mac Holbert's in Photoshop to make Midtone contrast snap.
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Thanks to both Val and Andrew for your answers.
Understand the Clarity adjustment is for midtone.
This makes sense, because in my experiements (trial and error, actually)
I've found it to do just that. Its super in adjusting the midtones and I find it can make quite a difference to the overall effect.
In fact, I find the whole range of adjustments in LR suit my style of photography pretty well. I'm pleased with LR.
Thanks again
Rob