Crossword Genius

Trespass in which female turns to cross barrier (2-5)

Ross

I believe the answer is:

ox-fence

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'barrier' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for ox-fence that I've seen is " barrier".)

I've seen this clue in The Sunday Times and The Times.
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