Insignificant person making the solving of the murder very difficult! (6)

I believe the answer is:

nobody

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'insignificant person' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for nobody that I've seen before include "Eg Pooter" , "Not one person" , "who can square the circle?" , "The Diary of a - - (G & W Grossmith)" , "Insignificant person" .)

I've seen this clue in The Irish News.

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