Crossword Genius

Hello! That means winter's here! (4)

Ross

I believe the answer is:

hail

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'hello' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for hail that I've seen before include "Old Roman salute, or frozen pellets" , "Shower of ice pellets" , "Falling ice pellets" , "Say hello to the ice pellets" , "Greet - precipitation" .)

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