Crossword Genius

Cry before party, as one become sombre? (7,2)

Ross

I believe the answer is:

sobered up

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

'as one become sombre?' is the definition.
(as opposed to drunk)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

I've seen this clue in The 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.