Large wooded area (6)
I believe the answer is:
forest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large wooded area</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 forest that I've seen before include "green area" , "Grow more rigid" , "See 15" , "Large wood" , "Land covered with trees" .)