Wooded or arable ground? (8)
I believe the answer is:
arboreal
'wooded' is the definition.
(I've seen this before)
'or arable ground?' is the wordplay.
'ground?' indicates anagramming the letters ('grind' the letters into a new form).
'or'+'arable'='orarable'
'orarable' with letters rearranged gives 'ARBOREAL'.
(Other definitions for arboreal that I've seen before include "Wooded" , "Tree-dwelling" , "high living" , "Inhabiting trees" , "Relating to trees" .)