Oahu welcome (5)
I believe the answer is:
aloha
'oahu welcome' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aloha that I've seen before include "A Hawaiian welcome" , "Hawaiian hello or goodbye" , "Welcome to Honolulu!" , "16 across in Hawaii" , "Hello from Honolulu?" .)