Crossword Genius

Give mistaken evidence of humanity (3)

Ross

I believe the answer is:

err

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'give' is the definition.
The definition and answer can be both related to thinking as well as being verbs in their base form.
Perhaps you can see an association between them that I don't see?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for err that I've seen before include "Make mistake in Canberra" , "Deviate" , "Transgress" , "Be mistaken" , "do something you shouldn't" .)

I've seen this clue in the Evening Standard.
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