Crossword Genius

What 'raining hard' could imaginably mean? (4)

Ross

I believe the answer is:

hail

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

'mean?' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?

'what raining hard could imaginably' is the wordplay.
I cannot quite understand how this works, but
'hard' could be 'h' (abbreviation used in pencil classifications) and 'h' is found in the answer.
The remaining letters 'ail' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for hail that I've seen before include "Greet, call or salute" , "Stones dropped" , "Greet or applaud" , "Old Roman salute, or frozen pellets" , "Precipitation of ice pellets" .)

I've seen this clue in the Evening Standard.
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