Removing Erroneous Directory Entries

[Adele Ponty]

One of the users on our system somehow managed to create an
entry in our user_data directory which now appears at the
top of the directory listing as,  -k@   .  A long listing 
reveals it to be some sort of link entry they tried to create;
l--------- -k@   ...    ...  -k@ -> df
Can someone tell me how to get rid of it?  Can I prevent this
from happening again?  Thanks in advance.

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