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Country house to mark changes without opening in March (5,5)

Ross

I believe the answer is:

south korea

I'm a little stuck... Click here to teach me more about this clue!

'country' is the definition.
(I know that South Korea is a country)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for south korea that I've seen is " Country with capital Seoul".)

I've seen this clue in The Telegraph.
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