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The site at address example.com has good rank for keyw widgets
and in G is visible only this link example.com/?u=www.widgets.com
The robots file says:
It may happen for less competitive keyword where title is just a heading and which is the keyword. It acts like a site ranking well for its own domain name.
When we can't crawl a site, we still try to find e.g. descriptions from the ODP to make the snippet prettier instead of completely empty. And if we think that's the best result, then we can show that url reference even if we haven't crawled the site.
Thank you for explanation.