Crossword Genius

The usual hailstorm (7)

Ross

I believe the answer is:

average

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

This could be a double definition.

'the usual' is the first definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for average that I've seen before include "Mean - ordinary" , "just like any other" , "Fair to middling" , "About normal or usual" , "mean maybe" .)

I've seen this clue in The Globe and Mail.
Want a hint initially instead of a full solution? Install my app