A neat prison (6,3)

I believe the answer is:

cattle pen

I'm a little stuck... Click here to teach me more about this clue!

'a neat prison' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'neat prison' is the wordplay.
'neat' becomes 'cattle' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'prison' becomes 'pen' (both can mean an enclosure).
'cattle'+'pen'='CATTLE PEN'

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

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