Wading bird under the weather, so we hear (4)
I believe the answer is:
ruff
'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" .)