Crossword Genius

Mouthful of water (7)

Ross

I think it could be either:

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5

7

estuary

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This could be a double definition.

'mouthful' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'water' is the second definition.
(I know that estuary is a type of water)

'of' acts as a link.

Can you help me to learn more?

(Other definitions for estuary that I've seen before include "form of English" , "route to sea" , "Weapon" , "Wide river mouth" , "A surety found in river's tidal mouth" .)

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