So what's new? Court is to exercise discretion (4,4)

I believe the answer is:

show tact

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

'so what's new? court is to exercise' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'discretion' is the wordplay.
I cannot quite understand how this works, but
'discretion' could be 'tact' (I've seen this before) and 'tact' is found in the answer.
The remaining letters 'show' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Guardian.

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.