Bird’s responsibility about slaughtered mole (9)
I believe the answer is:
guillemot
'bird's' is the definition.
(guillemot is a kind of bird)
'responsibility about slaughtered mole' is the wordplay.
'responsibility' becomes 'guilt' (being guilty of something).
'about' is an insertion indicator.
'slaughtered' indicates an anagram.
'mole' with letters rearranged gives 'lemo'.
'guilt' placed around 'lemo' is 'GUILLEMOT'.
(Other definitions for guillemot that I've seen before include "Diver" , "Diving bird" , "An auk" , "Seabird" , "Fisher" .)