Greet enthusiastically (4)
I believe the answer is:
hail
'greet enthusiastically' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for hail that I've seen before include "Greet, call or salute" , "Greet(ing) - frozen shower" , "Welcome - cold shower" , "Hard Rain?" , "Fall of ice" .)