The -clip- notification appears when there's too much signal coming in or going out of the TWA. The best way to fix it is to first lower the master gain just a bit.
Keep in mind there are TWO gains on the TWA, Master Gain and Effect Gain. Spend some time finding a good balance of the two and you should be able to fix any clipping issues. Here's how I do it.
It may take a day or so of making small adjustments until the TWA is set up perfectly with your guitar and pickup combination.
If you need more help with it, get in touch with me through a support ticket and I'll assist you.