Part of a tooth (6)
I believe the answer is:
enamel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">part of a tooth</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for enamel that I've seen before include "Ale men (anag.)" , "found on crowns" , "Vitrified coating for metal etc" , "Hard gloss paint" , "Shiny layer on surface" .)