Crossword Genius

Hunter and dog requiring no introduction (5)

Ross

I believe the answer is:

eagle

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'hunter' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for eagle that I've seen before include "part of round that's exceptional" , "High-flyer" , "King of birds" , "Keen-sighted bird of prey" , "Large birds of prey." .)

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