Army helicopter (6)
I believe the answer is:
apache
'army helicopter' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for apache that I've seen before include "Geronimo was one" , "N American Indian tribe or old Paris ruffian" , "North American Indian tribe - Paris ruffian" , "A peach of an Indian tribe?" , "American Indian - French gangster" .)