Animal coming back with tailless bird (6)
I believe the answer is:
godwit
'bird' is the definition.
(godwit is a kind of bird)
'animal coming back with tailless' is the wordplay.
'animal' becomes 'dog' (I have seen 'Domestic animal ' mean 'dog' so perhaps 'animal' could also mean 'dog').
'coming back' says the letters should be written backwards.
'tailless' means to remove the last letter (the tail of the word is removed).
'dog' in reverse letter order is 'god'.
'with' with its last letter removed is 'wit'.
'god'+'wit'='GODWIT'
(Other definitions for godwit that I've seen before include "Long-billed wader" , "Wader; two dig (anag.)" , "Large wading bird" , "Wader; do twig (anag.)" , "Long-legged northern shore bird" .)