I don't believe there's any way to auto stop when levels get into clipping. However, a few thoughts that might help. First, if you're working in 32 bit Floating Point, you can lower the levels later (using things like Dynamics Processing and/or Normalise) and you won't get any clipping. Second, since the overall level increases proportionately each time you add another clip, lower ALL levels before you start, then use Normalise/Dynamics Processing to raise the final mix to your desired level. Finally, if the clipping (red) comes from your source material, not within Audition, there's nothing Audition can do to fix it, Especially with MP3 recordings, this is all too common, trying to push the level as high as possible. Usually, despite the red, the clipping isn't too bad but the main suggesting is to lower the level at the recording stage.
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