It even may serve to conceal a gullibility (7)

I believe the answer is:

naivete

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'gullibility' is the definition.
(I've seen this in another clue)

I don't 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 "Ingenuousness" , "lack of experience" , "Innocence or guillibility" , "State of inexperience (French spelling)" , "Lack of worldliness" .)

I've seen this clue in the Evening Standard.

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