Hunter and dog requiring no introduction (5)
I believe the answer is:
eagle
'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." .)