Trustworthy intelligence?

I believe the answer is:

brains

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'intelligence?' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for brains that I've seen before include "Common sense" , "Small seeds or lines in wood" , "They're enclosed in skulls" , "Substance of the mind or intellect" , "They're all in your head" .)

I've seen this clue in the Evening Standard.

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