Bird’s audible celebration of cat’s passing? (9)
I believe the answer is:
Here is my best explanation:
'bird's' is the definition.
(kittiwake is a kind of bird)
'audible celebration of cat's passing?' is the wordplay.
I cannot quite understand how this works, but
'cat' could be 'kit' (I have seen 'Young cat' mean 'kit' so perhaps 'cat' could also mean 'kit') and 'kit' is found within the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for kittiwake that I've seen before include "Oceanic gull", "Arctic gull with yellow bill and black legs", "Small pearl-grey gull", "bird", "A seagull", "Bird" and "Gull".)