I would try to get clarification on what does and does not constitute a competitor. The ideal would be a definitive list of competitors for which this would ap

I would try to get clarification on what does and does not constitute a competitor. The ideal would be a definitive list of competitors for which this would apply, and any future competitors would be added by mutual agreement. They might not go for that though, so it might be fine to have a sufficiently narrow definition. Of course it also depends who the company is. If it's, like, Alphabet, their competitors are going to be a broad swath of companies. For most companies though, a fair non-compete wouldn't have to restrict your options too much.