Hopefully we can help you with any issues you might have with your device. Feel free to check out your device forum if you have any specific questions regarding it: Samsung Galaxy S3 - Android Forums
If you restart your device it should remove whatever was on your clipboard.
The clipboard is a function on the device. That works as a copy & paste feature. As stated above, the current copy file will delete itself either when the device is restarted, or another file has been copied.
If you have any other concerns, feel free to give us a shout.
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