Heathens (6)
I believe the answer is:
pagans
'heathens' is the definition.
('pagan' can be a synonym of 'heathen')
This is the entire clue.
(Other definitions for pagans that I've seen before include "Heathens or nature-worshippers" , "Non-believers" , "Unbelievers" , "They have no religious beliefs" , "Heathens or nature worshippers" .)