Naturist (6)
I believe the answer is:
nudist
'naturist' is the definition.
(I know that naturist can be written as nudist)
This is all the clue.
(Other definitions for nudist that I've seen before include "Sun worshipper" , "One who sheds clothes in camp or on beach" , "Streaker?" , "Person who believes in going unclothed" , "to cover nether regions - one wouldn't!" .)