Crossword Genius

Cinco de __ (4)

Ross

I believe the answer is:

mayo

(Other definitions for mayo that I've seen before include "County of north-west Ireland" , "Irish county - sauce (abbr)" , "You'll find it in the Emerald Isle" , "Irish county -- salad cream" , "Saucy thing" .)

I've seen this clue in the LA Times.
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