Interestingly, Lightroom has not advanced the "Cloning Tool" beyond simple Spot Removal!
It is quite effective with spot removal, and, in fact, you can adjust the Size of the tool to get rid of some larger "spots", but the fact is that it will not be a match for your Cloning Brush that you find in Elements when dealing with complex cloning problems.
That in itself is a good reason to have Elements alongside of Lightroom but there are other features in Elements that also go beyond the capabilities of Lightroom. Lightroom was built around a Raw processor, not a graphics processor, and so their approach to many things is different from what you would see in a good/basic image editor.