Imprisoned like old Peruvians? (5)

I believe the answer is:

incan

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'like old peruvians?' is the definition.
(the Inca were a historical people of Peru)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for incan that I've seen before include "Old Peruvian" , "Member of old Andean civilisation" , "Of a native Peruvian" , "like former S American civilisation" , "ancient civilization" .)

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