If the files/tables of the source instance were not cleaned after the clone then you can find out.
For example, look for <CONTEXT_NAME> under:
$APPLCSF/$APPLLOG or $APPLCSF/$APPLOUT
Or, startup/shutdown and CM/WF log files
Well, We normally clean everything after the clone.
Is there any table is having the clone data or any files having the IP address of the source etc?
Have you checked application log files of the source instance if they still exist? If not and you already purged/cleaned everything, then I don't think it's easy to find out.
Thanks Hussein. We removed everythiing as part of our clone.