A godsend that is somehow causing upset? (7,3,4)

I believe the answer is:

against the odds

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

'upset?' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'a godsend that is somehow' is the wordplay.
'somehow' indicates anagramming the letters.
'godsend'+'that'+'is'='godsendthatis'
'godsendthatis' with letters rearranged gives 'gainsttheodds'.
'a'+'gainsttheodds'='AGAINST THE ODDS'

'causing' is the link.

Can you help me to learn more?

I've seen this clue in The Times and The Sunday Times.

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.