Supplanted, as it happened (4,5)

I believe the answer is:

took place

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

'happened' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Perhaps there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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.