Stag's horn (6)
I believe the answer is:
antler
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stag's 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 "Bony outgrowth in the deer family" , "Branched animal horn" , "Part of a deer" , "part of Rudolph" , "Stag's horn" .)