Like the buildings at Machu Picchu (5)
I believe the answer is:
incan
'like the buildings at machu picchu' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for incan that I've seen before include "of ancient people" , "Pachacuti for example" , "ancient civilization" , "like former S American civilisation" , "Of former Peruvian race" .)