Ancient Andean (4)
I believe the answer is:
inca
'ancient andean' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for inca that I've seen before include "Ancient Peruvian like Cain" , "Old South American native" , "Pre-conquest South American Indian" , "lived in Peru" , "Pre-conquest Peruvian" .)