Machu Picchu builder (4)
I believe the answer is:
inca
'machu picchu builder' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for inca that I've seen before include "Pyramid builders" , "Ancient inhabitant of Peru" , "Original Peruvian" , "Member of old South American Indian people of Peru" , "Old person in race" .)