Crossword Genius

A part that can't be matched (7)

Ross

I believe the answer is:

oddment

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'a part that can't be matched' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

This is the entire clue.

Can you help me to learn more?

(Other definitions for oddment that I've seen before include "Leftover piece" , "An isolated article, something left over" , "Piece left over, no match" , "Curiosity, peculiarity" , "spare part?" .)

I've seen this clue in The Globe and Mail.
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