Tusk material (5)
I believe the answer is:
ivory
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tusk material</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 ivory that I've seen before include "Key perhaps" , "Off-white colour" , "Film director" , "Country on the Gulf of Guinea, a former French protectorate" , "Material from tusks of certain mammals" .)