Crossword Genius

A bird's complaint (6)

Ross

I believe the answer is:

thrush

I believe this clue is a double definition.

'a bird's' is the first definition.
(thrush is a kind of bird)

'complaint' is the second definition.
(thrush is a kind of health problem)

(Other definitions for thrush that I've seen before include "Mouth fungus or songbird" , "Common British songbird" , "sprue" , "Throstle" , "Songbird with brownish back and speckled breast" .)

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