Greetings letter from abroad with ring for papa (5)
I believe the answer is:
aloha
'greetings letter' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see an association between them that I can't see?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for aloha that I've seen before include "Hello from Honolulu?" , "16 across in Hawaii" , "Hawaiian farewell" , "A Hawaiian welcome" , "Hawaiian hello or goodbye" .)