The Crossword Centre Clue-Writing Competition

CCCWC August competition voters’ comments
 
Clue no. 56: Unusual South American city, surrounded by country to the North, all literally within city walls!

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A clue to CURIOSITY.
1 comment refers to this clue (from 1 competitor, 0 others)

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Comments on the clue
1.Unusual is an adjective though