Shortcut to copy text to clipboard and then search it on safari?
Using the built in 'Search With Google' service for Safari you can assign it a shortcut key combo.

I had to make sure that the normal service did not have a shortcut. Giving it one here does not work on my 10.10.2 os x





Now add a new Application shortcut for Safari: Using Search With Google  as the Menu title.









You then may have to relaunch Safari for it to pick it up and you can use it.

But now all you need to do is select some text in Safari and use the shortcut.