One representing our bit of land might make it an Airbnb briefly (9)
I believe the answer is:
britannia
'one representing our bit of land might' is the definition.
The definition suggests a singular noun which matches the answer.
'make it an airbnb briefly' is the wordplay.
'make' indicates an anagram.
'briefly' means to remove the last letter.
'it'+'an'+'airbnb'='itanairbnb'
'itanairbnb' with its final letter taken away is 'itanairbn'.
'itanairbn' with letters rearranged gives 'BRITANNIA'.
Can you help me to learn more?
(Other definitions for britannia that I've seen before include "Female warrior" , "province" , "Figure on fifty pence coins" , "our sitting representative" , "Former Royal yacht" .)