Crossword Genius

Sign on vacant premises including one dunny (6)

Ross

I believe the answer is:

toilet

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This might be a double definition.

'sign on vacant premises' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

'one dunny' is the second definition.
The definition suggests a singular noun which matches the answer.

'including' is the link.

Can you help me to learn more?

(Other definitions for toilet that I've seen before include "Lavatory paper" , "something to go on?" , "WC" , "where penny the cost?" , "Plumbing fixture" .)

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