I would generate a script on the database to be cloned, create a new db and execute the script on that DB.

In SQL EM, right click on the db to be cloned and select the 'Generate a script' option. Click the Show All button on the General tab then tick 'Script All Objects'. Go to the  Options tab and tick all Security Scripting and Table Scripting Options.

Don't save the script, the cloned database will probably change and it's easy to generate another script.