Appear suddenly with report before judge (3,2)
I believe the answer is:
pop up
'appear suddenly' is the definition.
(I've seen this before)
'with report before judge' is the wordplay.
'with' means one lot of letters go next to another.
'report' becomes 'pop' ('report' can mean a sudden explosive noise).
'before judge' becomes 'up' (up in court).
'pop'+'up' is 'POP-UP'.
(Other definitions for pop up that I've seen before include "three-dimensional picture book" , "book for youngster" , "which may interrupt computer user" , "Appear (like toast?)" , "Appear suddenly or unexpectedly" .)