Judge Judy ultimately accepts mimic runs pranks (6)
I believe the answer is:
japery
'judge judy ultimately accepts mimic runs pranks' is the definition.
I can't judge whether this definition defines the answer.
'judge judy ultimately accepts mimic runs' is the wordplay.
'judge' becomes 'J' (abbreviation for judge).
'ultimately' says to take the final letters.
'accepts' indicates putting letters inside.
'mimic' becomes 'ape' (ape can mean to copy or imitate).
'runs' becomes 'r' (cricket abbreviation).
The last letter of 'judy' is 'y'.
'j'+'y'='jy'
'ape'+'r'='aper'
'jy' placed around 'aper' is 'JAPERY'.
Can you help me to learn more?
(Other definitions for japery that I've seen before include "April fool activity" , "pantomime" , "Clowning" .)