Case for the prosecution? (10)

I believe the answer is:

accusative

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'case' is the definition.
(the accusative case in grammar)

I can't explain the remainder of the clue.

(Other definitions for accusative that I've seen before include "Bringing a charge" , "Tending to charge" , "Case expressing the object of an action" , "Case which needs objective" , "prosecuting" .)

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