breaking an act


during watching Extras ( TVShows ) I saw this phrase and didn't get the meaning.
- Sorry, the reason I'm here is I want to know what your plan of action is.What's your strategy? What is your business plan?
- My plan is when you get some work, then I can start making some money.Because what I'm no good at is, you know, breaking an act.
- So when I'm successful, you can deduct 12 and a half percent, no problem.
- 15 for adverts.That's what I'm hanging on for, really.

- You just want someone to call up and give me an advert.
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