Preserved like old Peruvian (5)

I believe the answer is:

incan

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'like old peruvian' 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 "of ancient people" , "Of ancient Peruvians" , "like former S American civilisation" , "Relating to a pre-conquest people of Peru" , "Pachacuti for example" .)

I've seen this clue in the Sydney Morning Herald.

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