Area of grass (4)
I believe the answer is:
lawn
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">area of grass</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lawn that I've seen before include "Fine cotton or grass garden" , "Area of tended grass" , "Grassed area" , "Blades trimmed" , "Bowling green" .)