To delete the cl-support files that you generate when you need to file a support ticket, use the sudo rm <file> command to remove the file(s). Make sure to specify the full file path:
cumulus@leaf01:mgmt-vrf:~$ ls -la /var/support/
total 1948
drwxr-xr-x 1 root root 82 Mar 25 10:52 .
drwxr-xr-x 1 root root 110 Dec 9 21:59 ..
-rw-r--r-- 1 root root 1994504 Mar 25 10:52 cl_support_leaf01_20200325_105153.txz
drwxr-xr-x 1 root root 0 Dec 9 21:55 core
cumulus@leaf01:mgmt-vrf:~$
cumulus@leaf01:mgmt-vrf:~$ sudo rm /var/support/cl_support_leaf01_20200325_105153.txz
cumulus@leaf01:mgmt-vrf:~$
cumulus@leaf01:mgmt-vrf:~$ ls -la /var/support/
total 0