Crossword Genius

Expected to resemble fresh water? (3)

Ross

I believe the answer is:

due

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'expected' is the definition.
(similar in meaning)

I don't understand how the rest of the clue works.

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(Other definitions for due that I've seen before include "Requisite" , "Expected; proper" , "Owed as a debt" , "Owed, or payable immediately" , "Unpaid or expected" .)

I've seen this clue in the Evening Standard.
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