Bishop united with bird and dog (6)
I believe the answer is:
beagle
'dog' is the definition.
(beagle is a kind of dog)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for beagle that I've seen before include "Hunting hound" , "Hound dog" , "5 [MANS BEST FRIEND]" , "Small, sturdy breed of hound" , "Short-haired dog" .)