Apex domains cannot have CNAME records.
Question and response
Question
dig cloned.org.uk. NS
Answer
cloned.org.uk. 5 NS ns2.ncuk.net.
cloned.org.uk. 5 NS ns0.ncuk.net.
cloned.org.uk. 5 NS ns1.ncuk.net.
cloned.org.uk. 5 NS ns4.ncuk.net.uk.
cloned.org.uk. 5 NS ns3.ncuk.net.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0