Grassy land (3)
I believe the answer is:
lea
'grassy land' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lea that I've seen before include "Open arable land (poet.)" , "Land growing grass" , "Meadow (poetic)" , "pastoral setting" , "''The lowing herd winds slowly o'er the ... '' (Gray)" .)