Quechua speaker of old (4)
I believe the answer is:
inca
'quechua speaker of old' 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 "Pre-conquest South American people" , "Native Peruvian" , "Member of old South American Indian people of Peru" , "Andean culture" , "South American (historical)" .)