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 Evening Standard and the LA Times.

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