I can find it on mine by opening the memo app, then once you begin creating a new note, hold the region where you are typing, it should give an option the view the clipboard.
There's probably an easier way but it works for me.
On your S5 click on your phone icon (like your going to make a phone call) Right above the number key pad is a blank space. Touch (hold the touch for a few seconds) that area and you will see what you have on your clipboard. You will then have an option to delete what ever items you have in your clipboard. If you touch that area and nothing shows up (again a long touch) you then have nothing on your clipboard.