As stated up there in my comment, Heatran is an ideal counter to Clefable. Standard Clefable sets have nothing to hit it. All you really need to do is keep it relatively healthy and you can stop Clefable easily. I suggest Heatran over other Steel types, and there is two reasons for this. The first is its Fire immunity, as most good Clefable sets run Flamethrower.
Definition. The genitive is the case (or function) of an inflected form of a noun or pronoun showing ownership, measurement, association, or source. Adjective: genitival. The suffix -'s on nouns is a marker of genitive case in English.
Infinitives. An infinitive is a verbal consisting of the word to plus a verb (in its simplest stem form) and functioning as a noun, adjective, or adverb. The term verbal indicates that an infinitive, like the other two kinds of verbals, is based on a verb and therefore expresses action or a state of being.