Crossword Genius

Quickly develops missiles in the Alps? (9)

Ross

I believe the answer is:

snowballs

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

But I can't explain it at all! Could you help me understand?

(Other definitions for snowballs that I've seen before include "Drinks" , "mushrooms?" .)

I've seen this clue in the Sydney Morning Herald.
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