Bird that is below par (5)
I believe the answer is:
eagle
'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" .)