Native American people (6)
(Other definitions for apache that I've seen before include "on the streets of Paris" , "Parisian ruffian - Indian" , "settler in Oklahoma?" , "Street ruffian" , "American Indian once found in Paris" .)
(Other definitions for navajo that I've seen before include "US native language" , "Native American from Arizona, New Mexico or Utah" , "A native American Indian people" , "N American Indian tribe" , "Native American - on Java (anag)" .)
'native american people' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sioux that I've seen before include "N. American natives" , "Native American people" , "Native Indian group" , "in Dakota" , "North American people" .)
(Other definitions for chinook that I've seen before include "hot wind" , "Native American - wind - helicopter" , "O in hock (anag)" , "Arctic wind" , "Rocky Mountains' wind - helicopter" .)
(Other definitions for mohican that I've seen before include "Hair style" , "elevated style" , "American Indian - hairstyle" , "Hawk-eye went with" , "Hairstyle with a tall, spiky wall of hair, shaved either side" .)