Judge Judy ultimately accepts mimic runs pranks (6)

'judge judy ultimately accepts mimic runs pranks' is the definition.
I can't judge whether this defines the answer.

'judge judy ultimately accepts mimic runs' is the wordplay.
'judge' becomes 'J' (abbreviation for judge).
'ultimately' indicates one should take the final letters.
'accepts' means one lot of letters goes inside another.
'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' enclosing 'aper' is 'JAPERY'.

Can you help me to learn more?