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All answers having "South American capital" as clue:

3 Character Answers:

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RIO



4 Character Answers:

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LIMA

PESO



5 Character Answers:

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LAPAZ

PESOS

QUITO

SUCRE



6 Character Answers:

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ADVISE

BOGOTA



7 Character Answers:

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CARACAS



8 Character Answers:

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ASUNCION

BRASILIA

LIMAPERU

SANTIAGO



10 Character Answers:

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MONTEVIDEO



11 Character Answers:

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BUENOSAIRES