Polish hound which is said to break kitchen appliance (8,5)

I believe the answer is:

sandwich press

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'hound which is said to break kitchen appliance' is the definition.
The definition suggests a singular noun which matches the answer.

'polish' is the wordplay.
I cannot quite see how this works, but
'polish' could be 'sand' (to polish or sand down) and 'sand' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

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

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