Cuzco inhabitant (4)
I believe the answer is:
inca
'cuzco inhabitant' 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 South American" , "Ancient Peruvian like Cain" , "Ancient inhabitant of Peru" , "Original Peruvian" , "Ancient civilisation of Peru" .)