Crossword Genius

Native of South America once imprisoned? (5)

Ross

I believe the answer is:

incan

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

This clue might be a double definition.

'native of south america once' is the first definition.

'imprisoned?' is the second definition.
Both the definition and answer are adjectives.
Maybe there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for incan that I've seen before include "about S American Indians" , "Member of old Andean civilisation" , "Royal Family member" , "Relating to South American civilisation" , "From old Peru" .)

I've seen this clue in The Times.
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