Natural dye (5)
I believe the answer is:
henna
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">natural dye</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 henna that I've seen before include "Stainer" , "Natural hair dye" , "Red-brown dye used for body decorations" , "hair colouring" , "Vegetable dye" .)