County’s crop meeting obstacle (8)
I believe the answer is:
cornwall
'county's' is the definition.
'crop meeting obstacle' is the wordplay.
'crop' becomes 'corn' (I've seen this before).
'meeting' is a charade indicator (letters next to each other).
'obstacle' becomes 'wall'.
'corn'+'wall'='CORNWALL'
(Other definitions for cornwall that I've seen before include "Duchy" , "Bodmin's county" , "County touching only one other" , "County of south-west England" , "hilly county" .)