Crossword Genius

As an upside-down horseshoe is supposed to be? (7)

Ross

I believe the answer is:

unlucky

(Other definitions for unlucky that I've seen before include "Hard cheese!" , "Not fortunate, ill-starred" , "Not fortunate, hapless" , "Ill-fated" , "How some see 13" .)

I've seen this clue in The Guardian.
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