Crossword Genius

Like an open field, not sold illegally? (8)

Ross

I believe the answer is:

unfenced

'like an open field' is the definition.

'not sold illegally?' is the wordplay.
'not' becomes 'un' (I've seen this in other clues).
'sold illegally?' becomes 'fenced' (I can't explain this - if you can you should believe this answer much more).
'un'+'fenced'='UNFENCED'

I've seen this clue in The Guardian.
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