Crossword Genius

Unknown problem encountered in solving murder? (6)

Ross

I believe the answer is:

nobody

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'unknown' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for nobody that I've seen before include "Ineffective person" , "The Diary of a --- (George &Weedon Grossmith)" , "Unimportant person" , "The Diary of a - - (G & W Grossmith)" , "Person without influence" .)

I've seen this clue in The Sun.
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