An unimportant person can complicate a murder trial (6)

I believe the answer is:

nobody

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'an unimportant 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 "being without value" , "The Diary of a --- (George &Weedon Grossmith)" , "Eg Pooter" , "Lightweight" , "Insignificant person" .)

I've seen this clue in The Irish Independent.

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