Crossword Genius

Bird’s repeated note (4)

Ross

I believe the answer is:

dodo

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

'repeated note' is the wordplay.
'repeated' says to double the letters.
'note' becomes 'do' (musical note, as in do-re-mi).
'do' doubled is 'DODO'.

(Other definitions for dodo that I've seen before include "Old bird" , "Old fogey" , "Repetitive extinct animal" , "Old-fashioned person" , "Proverbially dead bird" .)

I've seen this clue in The Times.
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