Polytheist (5)
I believe the answer is:
pagan
'polytheist' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for pagan that I've seen before include "Unbeliever" , "Heathen; non-believer" , "Polytheist" , "One who follows a polytheistic or pre-Christian religion, but not a Jew" , "Not conventionally religious" .)