Government official briefly in Irish county (4)
I believe the answer is:
mayo
'irish county' is the definition.
(county in Ireland)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for mayo that I've seen before include "radio presenter" , "County of Western Eire" , "Thick creamy dressing" , "Ir. county; salad dressing" , "Irish county - sauce (abbr)" .)