Demonstrate one's humanity (3)

I believe the answer is:

err

'demonstrate one's humanity' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for err that I've seen before include "Drop a clanger" , "Miscalculate" , "Miss the mark" , "Be mistaken" , "Make mistake in Canberra" .)

I've seen this clue in the LA Times and the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.