Crossword Genius

Creamy dressing somewhere in Ireland (4)

Ross

I believe the answer is:

mayo

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'creamy dressing' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for mayo that I've seen before include "Eg, Braeburn or Cox" , "Saucy thing" , "Irish county -- salad cream" , "radio presenter" , "Cold, creamy sauce (abbr)" .)

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