Dog trapping naughty lad's bird (4,5)
I believe the answer is:
bald eagle
'bird' is the definition.
(bald eagle is a kind of bird)
'dog trapping naughty lad's' is the wordplay.
'dog' becomes 'beagle' (beagle is a kind of dog).
'trapping' is an insertion indicator.
'naughty' indicates anagramming the letters.
'lad' is an anagram of 'ald'.
'beagle' going around 'ald' is 'BALD EAGLE'.
(Other definitions for bald eagle that I've seen before include "National bird of the USA" , "N. American bird" , "Flier" , "National emblem of the USA" , "US national bird" .)