Crossword Genius

I will not appear in most significant piece (3)

Ross

I believe the answer is:

man

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'piece' is the definition.
(man can mean a chess piece)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for man that I've seen before include "-- Friday" , "The most destructive and polluting animal" , "Fellow" , "Isle of -; chess piece" , "Geezer" .)

I've seen this clue in The Independent.
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