One opposed to prosecution? (7)
I believe the answer is:
defence
'prosecution?' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see a link between them that I can't see?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for defence that I've seen before include "shelter" , "Case for the accused" , "See 12" , "This department deals with national protection" , "Protection; justification" .)