Cain's other people (5)

I believe the answer is:

incas

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'people' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'cain's other' is the wordplay.
'other' indicates an anagram.
'cains' anagrammed gives 'INCAS'.

Can you help me to learn more?

(Other definitions for incas that I've seen before include "Peruvian natives" , "Ancient Peruvians" , "Old Peruvians" , "South Americans whose empire fell to Spain" , "Members of ancient Peruvian race" .)

I've seen this clue in The Globe and Mail.

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