Brownish pigment (5)
I believe the answer is:
umber
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">brownish pigment</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 umber that I've seen before include "Deep brown" , "Brown earthy mineral" , "Brownish pigment" , "Yellowish-brown pigment" , "Dark brown (pigment)" .)