Varnish ingredient (3)
I believe the answer is:
lac
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">varnish ingredient</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 lac that I've seen before include "Red resin secreted by insects" , "Ingredient of varnish" , "thousands from India" , "100,000 in rupees" , "insects secrete this" .)