The solution provided to JRA-8497 will not work in our case.
This is related to the 'working as designed' described in JRA-10210

We would like the clone ability to be shut off for only one project in our JIRA. This is because when an issue is cloned, it does not automatically get assigned to the default assignee and therefore there is not an e-mail sent via our notification scheme to the appropriate persons. We are encouraging users to re-open issues rather than clone them so they are not lost. However, this is not working so nicely. Is there a way to simply turn 'clone' off for a single project without affecting all projects within that instance of JIRA?

Thanks.