Naturism (6)
I believe the answer is:
nudism
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">naturism</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that naturism can be written as nudism)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nudism that I've seen before include "Practice of going without clothes" , "Mind us (anag)" , "early practice in Eden" , "Pursuit of a naturist" , "Public exposure" .)