Land for grazing is beyond river (7)
I believe the answer is:
pasture
'land for grazing' is the definition.
(I've seen this before)
'beyond river' is the wordplay.
'beyond' becomes 'past' (I've seen this before).
'river' becomes 'ure' (I have seen 'River of Wensleydale ' mean 'ure' so perhaps 'river' could also mean 'ure').
'past'+'ure'='PASTURE'
'is' is the link.
(Other definitions for pasture that I've seen before include "Stock holder, perhaps" , "Field suitable for grazing" , "Land for grazing cattle" , "Grassland" , "Land suitable for grazing" .)