Apex domains cannot have CNAME records.
Question and response
Question
dig clearhello.com. NS
Answer
clearhello.com. 5 NS ns-1295.awsdns-33.org.
clearhello.com. 5 NS ns-87.awsdns-10.com.
clearhello.com. 5 NS ns-953.awsdns-55.net.
clearhello.com. 5 NS ns-1780.awsdns-30.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0