Ancient Peruvians (5)
I believe the answer is:
incas
'ancient peruvians' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for incas that I've seen before include "conquered by Spain" , "People from Andes who settled in Peru" , "South Americans whose empire fell to Spain" , "Old South American royals" , "Cain's people in old Peru" .)