Crossword Genius

Saucy county? (4)

Ross

I believe the answer is:

mayo

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'county?' is the definition.
(county of Ireland)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for mayo that I've seen before include "part of Ireland" , "Irish county (county town, Castlebar)" , "Salad dressing (informal)" , "You'll find it in the Emerald Isle" , "Ir. county; salad dressing" .)

I've seen this clue in The Independent.
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