If an enrolment goes for 8 weeks without an attendance submitted the department will cease it. This is the equivalent of the old ‘deemed exit’ process from CCMS.
If you need to restart an enrolment under CCS you don’t need to clone it.
Simply edit the start date, choose a new start date that is after the ceased date and covers any new attendances then resubmit the enrolment. This will wake the enrolment back up and you can then submit attendances as normal.