This service is part of Symantec's advanced threat protection service. Symantec clicktime protection safeguards you against targeted phishing attacks.
You may have received links that begin with https://clicktime.symantec.com, when you click on these links, Symantec will inspect that webpage and ensure that it is safe. If the webpage is clean, you will be automatically redirected, if something malicious was detected, then you will be notified, preventing the webpage from delivering malicious content to you.
Learn more about Advanced Threat Protection and how Symantec can help you.