Crossword Genius

Unlike a shamrock (4-4)

Ross

I believe the answer is:

four-leaf

(Other definitions for four-leaf that I've seen before include "This clover is considered lucky" , "'I'm looking over a . . . . . . . . clover' (song)" , "This clover is said to be lucky" .)

I've seen this clue in The New York Times.
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