Godfather may be facing extinction (5)
I believe the answer is:
panda
This could be a double definition.
'godfather' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'facing extinction' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'may be' acts as a link.
(Other definitions for panda that I've seen before include "Large bear from the bamboo forests of China and Tibet" , "WWF symbol" , "Endangered bamboo eater" , "Bamboo-eater" , "Raccoon-like animal" .)