Thanks Schewe. Agreed, it is different.
Just went into LR3, opened an image with Shadows I was able to recover and then ran the Clarity all the way to the right. The Shadows remained untouched.
Went into LR4, same image, same procedure as above but ran Clarity just a little to the right and the Shadows blocked immediately.
What can I say, I've actually never thought of running Contrast to the Left. I don't like the milky filter it produces, although running it from 0 to -5 was OK. Thanks.