One baring all (6)
I believe the answer is:
nudist
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one baring all</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nudist that I've seen before include "exhibitionist" , "Dustin (anag)" , "one leading a bare existence" , "One going unclothed" , "Person who believes in going unclothed" .)