Crossword Genius

County with a new balance (6)

Ross

I believe the answer is:

antrim

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

I cannot understand how the rest of the clue works.

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(Other definitions for antrim that I've seen before include "NI county" , "Irish county of musically green glens" , "County of Northern Ireland" , "Giant's Causeway county" , "NI town" .)

I've seen this clue in The Times and The Sunday Times.
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