It won't be TDS or Tax Deduction at Source because you do not have any liability to your broker for the Tax. That was just to clear that its not TDS.
Now the question, where to show it? Take my advice if you are getting some money and remitting it to India then its risky to show that to Tax Department. I am not saying that you hide it, its just not safe unless until you know what you are doing is legal. It could turn as "aa bail mujhe maar".
If you still want to show it then, it would be treated as Capital Account Transaction Gain which means "Business". I do not have any further idea...
may be you can search "you tube" :rofl: :rofl: :rofl: :rofl: