Crossword Genius

Great section seen when Brazil and Argentina meet (5)

Ross

I believe the answer is:

large

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'great' is the definition.
(I know that great can be written as large)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for large that I've seen before include "Big, great" , "Little's late partner" , "Stout" , "Strapping" , "Vast" .)

I've seen this clue in The Independent.
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