Small forest (4)
I believe the answer is:
wood
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small forest</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 wood that I've seen before include "deal?" , "Material from trees" , "Grove" , "Driver, perhaps" , "Old conductor" .)