Give mistaken evidence of humanity (3)
I believe the answer is:
err
'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" .)