Crossword Genius

It would be difficult to find one in a haystack (6)

Ross

I believe the answer is:

needle

(Other definitions for needle that I've seen before include "be irritating ?" , "Annoy by continuous criticism; stylus" , "narrow-eyed one" , "Provocation" , "Leaf of a 15 across" .)

I've seen this clue in The Irish Times.
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