There isn't a separate clone permission. If a user is allowed to create an issue in a project they should also be able to clone an issue. I tested this by cloning an issue and then removing the create issue permission for a user and they were no longer able to clone the issue as that option was no longer available.
Since I am not familiar with your setup, I would check to ensure that group has the create issue permission.
Teams break work down in order to help simplify complex tasks. This is often done iteratively, with tasks being broken down into smaller tasks and so on until the work is accurately captured in well-...
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