Crossword Genius

Mafia leader is out initially to cause suffering in a sworn statement produced by theatrical types (2,2,4)

Ross

I believe the answer is:

do no harm

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

'sworn statement produced by theatrical types' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'mafia leader is out initially to cause suffering in a' is the wordplay.
I cannot really see how this works, but
'cause' could be 'don' (Don is an example) and 'don' is found within the answer.
'a' is within the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Irish Times.
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