Crossword Genius

Impenetrable row of crops at one end of the country? (8)

Ross

I believe the answer is:

cornwall

'one end of the country?' is the definition.
(county at the southwest point of England)

I can't explain the rest of the clue.

(Other definitions for cornwall that I've seen before include "Duchy" , "Southern English county" , "hilly county" , "Crown all in the English county, strangely" , "Part of 1 25 [KING LEAR]" .)

I've seen this clue in The Guardian.
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