Crossword Genius

Water at the mouth (5)

Ross

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5

7

delta

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This could be a double definition.

'water' is the first definition.
The definition and answer can be both natural objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'the mouth' is the second definition.
(I've seen this before)

'at' acts as a link.

Can you help me to learn more?

(Other definitions for delta that I've seen before include "Area where a river divides before entering the sea" , "Eg, outlet of the Nile" , "The fourth Greek letter found at river's mouth" , "Silted estuary" , "Mouth of, eg, the Nile" .)

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