Area of grass (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
lawn
'area of grass' is the definition.
(I've seen this before)
This is all the clue.
(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" .)