Suddenly appear in court after season (6,2)

I believe the answer is:

spring up

'suddenly appear' is the definition.

'in court after season' is the wordplay.
'in court' becomes 'up'.
'after' says to put letters next to each other.
'season' becomes 'spring' (spring is a kind of season).
'up' put after 'spring' is 'SPRING UP'.

(Another definition for spring up that I've seen is " Suddenly develop".)

I've seen this clue in The Telegraph.

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