What is the reason to clone issues? When you are too lazy to copy&paste strings from already created issue to the new one. Or when you have same task for various developers.
But you won't need to clone issue to have same person have 2 completely same issues.
So - I want to tell that you always edit issue after cloning. So why not to do following workflow:
istead of

1. click "Clone"
2. create new issue
3. edit new issue
   do
4. click "Clone"
5. edit new issue
6. create new issue

Currently it is possible only to change issue title - why not to allow to edit all issue fields.
Another reason to do this - if you clone issue 5 times and then reassign clones to different developers - original issue owner will receive 5 email notifications that he has 5 new issues.