How insignificant person avoids murder charge? (6)

I believe the answer is:

nobody

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'how insignificant person' is the definition.
'nobody' can be an answer for 'person' (nobody is a kind of person). I am not certain of the 'how insignificant' bit.

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

Can you help me to learn more?

(Other definitions for nobody that I've seen before include "Person without influence" , "who can square the circle?" , "Insignificant person" , "Not one person" , "Eg Pooter" .)

I've seen this clue in The Guardian.

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