A clerihew is a type of funny poem that follows a specific pattern. It has four lines, and the first line is usually the name of a person. The second line rhymes with the first line and makes a silly statement about that person. The third line is also a rhyme, and it usually continues the silly statement. The fourth and final line is the name of another person that rhymes with the first person's name.
For example, here is a clerihew about Albert Einstein:
Albert Einstein
Had a great mind, it was divine
But his hair was a crazy sight
It's like he never used a comb in sight!
See how the first line is Albert Einstein, and the second and third lines make a silly statement about him? The fourth line then rhymes with his name - in this case, "sight" rhymes with "Einstein."
People like to make clerihews about famous people, but you can make them about anyone you want! The sillier and funnier, the better. So go ahead and give it a try - see if you can make your own clever clerihew!