In heroku website, go to My Apps and select the app on which you have installed ClearDB.
On the top corner click on Addons and then select ClearDB MySQL Database.
Once there, click on your database and choose the 'Endpoint Information' tab. There you see your username/password. The URL to the database can be acquired by running
heroku config --app <YOUR-APP-NAME> in the command line.
In my case, it was something like: mysql://user:pass@us-cdbr-east.cleardb.com/DATABASE?reconnect=true
What you need is this part: us-cdbr-east.cleardb.com
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