Negative jerks disregarding good quality of Forrest Gump ? (7)

I believe the answer is:

naivete

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'negative' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for naivete that I've seen before include "Greenness" , "natural simplicity" , "State of inexperience (French spelling)" , "Ingenuosity" , "Innocence, artlessness" .)

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