Crossword Genius

Law firm prosecutes initial X to secure copyright against X (8)

Ross

I believe the answer is:

practice

I'm a little stuck... Click here to teach me more about this clue!

'law' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?

'firm prosecutes initial x to secure copyright against x' is the wordplay.
I cannot really understand how this works, but
'secure' could be 'ice' (I've seen this in another clue) and 'ice' is found in the answer.
'copyright' could be 'c' (as in the copyright symbol, a C in a circle) and 'c' is found in the answer.
The remaining letters 'prat' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for practice that I've seen before include "Team of doctors" , "It's said to make perfect" , "Exercise; professional business" , "attempt at perfection" , "Doctor's premises" .)

I've seen this clue in the Sydney Morning Herald.
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