Apex domains cannot have CNAME records.
Question and response
Question
dig devonmanor.com. NS
Answer
devonmanor.com. 3 NS ns-920.awsdns-51.net.
devonmanor.com. 3 NS ns-1784.awsdns-31.co.uk.
devonmanor.com. 3 NS ns-1816.awsdns-35.co.uk.
devonmanor.com. 3 NS ns-528.awsdns-02.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0