Indigenous, aboriginal (6)
I believe the answer is:
native
This clue is a double definition.
'indigenous' is the first definition.
(similar in meaning)
'aboriginal' is the second definition.
(I know that aboriginal can be written as native)
(Other definitions for native that I've seen before include "Indigenous, aboriginal" , "Son" , "One locally born" , "Of person, belonging by birth to place" , "Local inhabitant" .)