Crossword Genius

Person being disloyal or missing characteristic (5)

Ross

I believe the answer is:

trait

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'characteristic' is the definition.
(I've seen this in other clues)

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

Can you help me to learn more?

(Other definitions for trait that I've seen before include "Feature of personality" , "Mannerism" , "Decorative band" , "Habit" , "Characteristic or distinguishing quality" .)

I've seen this clue in The Irish Independent.
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