Indigo dye (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">indigo 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 anil that I've seen before include "A blue dye" , "Indian man" , "Colouring" , "It produces dye" , "Shrub yielding indigo" .)