Referrer For Visitors from PPC Campaigns

Hello,

is there a way to see the full referer for traffic labeled "Advertising"?

Best suggestion would be to use Campaigns using the UTM tags. This way you can specify the source of the advertising is coming from (e.g. Google, Bing, Facebook, other source) in the Campaign tag and will know these details in the analytics.

Here is a URL builder for campaigns from Google that will work in Clicky and most analytic tool:
https://support.google.com/analytics/answer/1033867?hl=en