Bathroom powder (4)
I believe the answer is:
talc
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bathroom powder</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for talc that I've seen before include "Soft mineral; powder" , "Powdered mineral" , "In brief, popular body powder" , "I may dust" , "(Mineral providing) powder" .)