Love of Hawaii (5)
I believe the answer is:
aloha
'love of hawaii' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'love of hawaii' is the wordplay.
'love of' becomes 'alo' (I am not sure about this - if you are sure you should believe this answer much more).
'hawaii' becomes 'HA' (abbreviation for Hawaii).
'alo'+'ha'='ALOHA'
Can you help me to learn more?
(Other definitions for aloha that I've seen before include "Hawaiian "ciao"" , "Hello from Honolulu?" , "Welcome to Honolulu!" , "greeting in Oahu" , "A greeting in Hawaii" .)