Crossword Genius

Greeting from heaven? (4)

Ross

I believe the answer is:

hail

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'greeting' is the first definition.
(hail is a kind of greeting)

'heaven?' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'from' is the link.

Can you help me to learn more?

(Other definitions for hail that I've seen before include "Fall of ice" , "Signal to and summon, say a taxi" , "cold weather" , "Old Roman salute, or frozen pellets" , "wintry weather" .)

I've seen this clue in the Evening Standard.
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