Crossword Genius

Unimportant person’s problem encountered in solving murder? (6)

Ross

I believe the answer is:

nobody

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

I cannot understand how the rest of the clue works.

(Other definitions for nobody that I've seen before include "who can square the circle?" , "problem for Morse?" , "being without value" , "Lightweight" , "Literary diarist" .)

I've seen this clue in The Times.
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