Crossword Genius

Wading bird under the weather, so we hear (4)

Ross

I believe the answer is:

ruff

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'wading bird' is the definition.
(ruff is a kind of wading bird)

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

Can you help me to learn more?

(Other definitions for ruff that I've seen before include "Starched frill collar" , "Starched frill; fish" , "Jacobean neckwear" , "Win a trick by using a trump" , "Ring of fur around neck of bird or animal" .)

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