Greeting from Hawaii always uplifting (4)
I believe the answer is:
hiya
'greeting' is the definition.
(I've seen this before)
'hawaii always uplifting' is the wordplay.
'hawaii' becomes 'HI' (US postal abbreviation).
'always' becomes 'ay' (archaic term for 'always').
'uplifting' says the letters should be written in reverse.
'ay' back-to-front is 'ya'.
'hi'+'ya'='HIYA'
'from' is the link.
(Other definitions for hiya that I've seen before include "modern form of salve?" , "Hello!" , "Informal greeting" , "Informal 19 across" .)