I tend to ponder the meaning of words, most people tend to equate clever with intelligence or education. But really it's not the same, is it? Watching Doctor Who made me think of this
It's really more about seeing creative/novel solutions to problems and the speed at which it happens.
Like Newton was highly intelligent, but Einstein was really clever.
Can you think of anyone you know that is really clever but not necessarily highly educated/intelligent? It's rather hard to distinguish in practical application, except in larger than life cases like Einstein.
Could we make a test to measure cleverness one day? Or is it realistically indistinguishable?