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Amazing finch grew odd ribs and flew without wings (10)

Ross

I believe the answer is:

incredible

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'amazing' is the definition.
(thesaurus)

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

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(Other definitions for incredible that I've seen before include "Fantastic" , "Impossible to believe" , "Beyond belief" , "Unbelievable" .)

I've seen this clue in The Independent.
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