Hi @Eduard Diez Kindly follow steps to remove Clone button.
https://community.atlassian.com/t5/Jira-questions/Can-I-prevent-users-from-cloning-issues-on-a-specific-project/qaq-p/686125 :- Properly Answered in this post.
in below link. You can restrict Clone issue as per User Role.
Hi @Eduard Diez ,
Restricting cloning of the issue is not possible as there is no permission specifically for it.
There are few by-pass was to totally restrict the cloning, here is a similar ticket for your reference: https://community.atlassian.com/t5/Jira-questions/how-to-restrict-issue-cloning-per-project-in-jira/qaq-p/141444