Large fern (7)
I believe the answer is:
bracken
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large fern</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bracken that I've seen before include "Type of fern" , "A mass of wild ferns" , "Coarse ferns" , "Common fern" , "Coarse moorland fern" .)