Why should he have the lion's share? (3)
I believe the answer is:
hog
This might be a double definition.
'why should he' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'have the lion's share?' is the second definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
Can you help me to learn more?
(Other definitions for hog that I've seen before include "Take greedily" , "Gourmand" , "Selfishly keep" , "Take more than one's share" , "Monopolise" .)