Yes, there is a stopper. No, it's not a clip.

To my 2nd bracelet (the first is of Pandora, so I have a very good quality compared) I ordered two of these "clips". When they arrived, I realized sadly that they are not clipped on the threads to hold (like Pandora usual), but probably turned on the bracelet or need to be striped and the thread then by a thin rubber layer. Unfortunately I did not get the "clip" on the first thread without strong concerns that the rubber could tear. I'll return the stopper, can be done without. Otherwise, the quality for the price looks pretty good, stopper is stamped as 925 silver.