Thanks for the reply. I'm afraid that this is the icon in safari toolbar.
Clipper was downloaded and installed from the link you cited above.
I've tried uninstalling it from Safari, then rebooted, but the icon still shows in the Safari toolbar, even though it is no longer listed when I go to Safari preferences, then extensions. The icon just stayed in the toolbar and clicking on it gave the same results as before: no full menu, just options to save screenshots.
Downloaded and installed clipper again and still the same results.
OS X 10.9.5