Grassy area beyond river (7)
I believe the answer is:
pasture
'grassy area' is the definition.
'pasture' can be an answer for 'area' (pasture is a kind of area). I'm unsure of the 'grassy' bit.
'beyond river' is the wordplay.
'beyond' becomes 'past' (to go beyond something is to go past it).
'river' becomes 'ure' (river in Yorkshire).
'past'+'ure'='PASTURE'
Can you help me to learn more?
(Other definitions for pasture that I've seen before include "Grass for grazing" , "Land for grazing cattle" , "Meadow" , "Stock holder, perhaps" , "Land suitable for grazing" .)