Crossword Genius

Republic that crosses the line? (7)

Ross

I believe the answer is:

ecuador

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This might be a double definition.

'republic that crosses' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'line?' is the second definition.
The definition and answer can be both locations as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

'the' is the link.

Can you help me to learn more?

(Other definitions for ecuador that I've seen before include "Quito's nation" , "Is Cora due out in South America?" , "S. American nation" , "South American country, capital Quito" , "The state capital is Quito" .)

I've seen this clue in The Times.
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