Crossword Genius

Peculiarity that couples never have? (7)

Ross

I believe the answer is:

oddness

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

I don't understand how the rest of the clue works.

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(Other definitions for oddness that I've seen before include "It isn't even" , "Curious state" , "a peculiarity of character" , "Peculiar quality" , "Peculiarity characteristic" .)

I've seen this clue in The Times.
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