Queen might have to cough up for this unfurnished vestibule, according to Spooner (8)
I believe the answer is:
hairball
This clue could be a double definition.
'queen' is the first definition.
The definition and answer can be both animals as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'have to cough up for this unfurnished vestibule according to spooner' is the second definition.
The definition suggests a singular noun which matches the answer.
'might' acts as a link.
Can you help me to learn more?
(Other definitions for hairball that I've seen before include "Uncomfortable thing in a cat's stomach?" , "Furry mass forming in cat's stomach" , "Reason for cat cough?" , "Something forming in a cat's stomach" , "Bundle of fur coughed up by cat" .)