Apex domains cannot have CNAME records.
Question and response
Question
dig worksmartnot.com. NS
Answer
worksmartnot.com. 4 NS ns-1937.awsdns-50.co.uk.
worksmartnot.com. 4 NS ns-1792.awsdns-32.co.uk.
worksmartnot.com. 4 NS ns-942.awsdns-53.net.
worksmartnot.com. 4 NS ns-1331.awsdns-38.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0