Shoat’s laces are really dirty sights (8)

I believe the answer is:

pigsties

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'really dirty sights' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps you can see an association between them that I can't see?

'shoat's laces' is the wordplay.
'shoat's' becomes 'pigs' (I can't justify this - if you can you should give a lot more credence to this answer).
'laces' becomes 'ties' (I've seen this in another clue).
'pigs'+'ties'='PIGSTIES'

'are' acts as a link.

Can you help me to learn more?

(Another definition for pigsties that I've seen is " Homes for porkers or very dirty places".)

I've seen this clue in the Sydney Morning Herald.

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