Crossword Genius

Bird that is below par (5)

Ross

I believe the answer is:

eagle

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'bird' is the definition.
(eagle is a type of bird)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for eagle that I've seen before include "Erne, perhaps" , "Valuable piece" , "Old comic" , "Raptor" , "Fine achievement on course" .)

I've seen this clue in The Irish News and The Globe and Mail.
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