What's the best method to see the customers of a given company? e.g. if I work for http://Radar.com, what's the best clay play to run, to see every customer listed on our website or elsewhere?

Use the "Extract B2B Customers from Domain" workflow. Simply input your company URL (like radar.com), and Claygent will automatically find your customer success page and extract all listed customers. [clay.com This workflow can find customers from your website's customer page or case studies section without manual work.