Copper went into new case to make a charge (6)
I believe the answer is:
accuse
'a charge' is the definition.
(charge in court)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for accuse that I've seen before include "Blame for a crime" , "Charge with a crime" , "Put on trial" , "Charge with wrong-doing" , "make charges" .)