How do I remove a duplicate clone?

I have a job in NetWorker 9.1.1.9 that unintentionally cloned twice, each with different retention times. A backup was run and then two clones to tape were made. One clone tape was made with a retention of 10 years and the other clone tape was made with a retention of 1 year.

What is the proper way to get rid of the clone tape with the 1 year retention? We want to keep the clone that has the 10 year retention.