Reddish-brown hair dye (5)
I believe the answer is:
henna
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reddish-brown hair dye</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for henna that I've seen before include "Reddish dye for hair etc" , "Shrub used for cosmetic colouring" , "Red-brown plant dye" , "Natural hair dye" , "Vegetable dye" .)