Deer horn (6)
I believe the answer is:
antler
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">deer horn</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 antler that I've seen before include "Reindeer horn" , "Part of a deer" , "Stag's horn" , "Deer's branching horn" , "Deer-horn" .)