Who are the cleverest people in the world?

King Solomon.

(The WISEST man ever)

The following are the reasons for this anwer

2Ch 1:11 And God said to Solomon, Because this was in thine heart, and thou hast not asked riches, wealth, or honour, nor the life of thine enemies, neither yet hast asked long life; but hast asked wisdom and knowledge for thyself, that thou mayest judge my people, over whom I have made thee king:

2Ch 1:12 Wisdom and knowledge is granted unto thee; and I will give thee riches, and wealth, and honour, such as none of the kings have had that have been before thee, neither shall there any after thee have the like.

1Ki 4:29 And God gave Solomon wisdom and understanding exceeding much, and largeness of heart, even as the sand that is on the sea shore.

1Ki 4:30 And Solomon's wisdom Excelled the wisdom of all the children of the east country, and all the wisdom of Egypt

1Ki 10:23 So king Solomon exceeded all the kings of the earth for riches and for wisdom.