Christmas tree (6,6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">christmas tree</span>' is the definition.<br/ ><span class="explanation-format__explanation">(firs are often used as Christmas trees)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for fir that I've seen before include "Evergreen tree for Gaelic men" , "Conifer tree" , "Evergreen tree for Irish men?" , "Tree with cones" , "Scots pine" .)