Boos in court - uneasy judge ultimately slammed challenge to authority (3,6,2,7)

I believe the answer is:

you cannot be serious

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

'boos in court uneasy judge ultimately slammed challenge to authority' is the definition.
I know that 'court' relates to this answer.

'boos in court uneasy judge ultimately slammed' is the wordplay.
'ultimately' says to take the final letters.
'slammed' indicates an anagram.
The final letter of 'judge' is 'e'.
'boos'+'in'+'court'+'uneasy'+'e'='boosincourtuneasye'
'boosincourtuneasye' with letters rearranged gives 'YOU CANNOT BE SERIOUS'.

Can you help me to learn more?

I've seen this clue in The Independent.

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.