Crossword Genius

Stone stool left in a pond when the tide goes out (8)

Ross

I believe the answer is:

rockpool

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'a pond when the tide goes out' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'stone stool left' is the wordplay.
'stone' becomes 'rock' (synonyms).
'stool' becomes 'poo' (both can mean excrement).
'left' becomes 'l' (common abbreviation).
'rock'+'poo'+'l'='ROCKPOOL'

'in' is the link.

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