Fern leaf (5)
I believe the answer is:
frond
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fern leaf</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 frond that I've seen before include "part of palm" , "Leaf-like organ" , "Fern leaf" , "Palm leaf" .)