It may result not only in the weather breaking (7,5)

I believe the answer is:

falling glass

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

'weather breaking' is the definition.
I know nothing about this answer so I can't tell whether this works.

'it may result not only in' is the wordplay.
I cannot quite understand how this works, but
'in' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

'the' is the link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.