[katnip]

clev·er ( P ) Pronunciation Key (klvr)
adj. clev·er·er, clev·er·est
Mentally quick and original; bright.
Nimble with the hands or body; dexterous.
Exhibiting quick-wittedness: a clever story.
New England. Easily managed; docile: “Oxen must be pretty clever to be bossed around the way they are” (Dialect Notes).
New England. Affable but not especially smart.
Chiefly Southern U.S. Good-natured; amiable. See Regional Note at ugly.

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[Middle English cliver;; akin to East Frisian klifer, klüfer. See gleubh- in Indo-European Roots.]

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clever·ly adv.

[paulklenk]

Excellent work! What's your source? I'd love a link.

[South40]

cleav•age (kl v j)
n.
1. The act of splitting or cleaving.
2. The state of being split or cleft; a fissure or division.
3. Mineralogy. The splitting or tendency to split of a crystallized substance along definite crystalline planes, yielding smooth surfaces.
4. Embryology.
a. The series of mitotic cell divisions that produces a blastula from a fertilized ovum. It is the basis of the multicellularity of complex organisms. Also called segmentation.
b. Any single cell division in such a series.
5. Chemistry. The splitting of a complex molecule, such as a polysaccharide, into simpler molecules.
6. Informal. The hollow between a woman's breasts, especially as revealed by a low neckline.

[ShadowDancer]

Where did you find that? Webster's does not list it as a word form at all of clever.

[JustPiper]

That was to be my question if cleverer was even a word ;)