Chichén Itzá builder (5)
I believe the answer is:
mayan
'chichen itza builder' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mayan that I've seen before include "Relating to a people of Central America" , "Pre-Conquest inhabitant of Central America" , "from an ancient culture" , "Former native of Central America" , "of a bygone civilisation" .)