Apex domains cannot have CNAME records.
Question and response
Question
dig theguidess.com. NS
Answer
theguidess.com. 5 NS ns-1701.awsdns-20.co.uk.
theguidess.com. 5 NS ns-417.awsdns-52.com.
theguidess.com. 5 NS ns-565.awsdns-06.net.
theguidess.com. 5 NS ns-1135.awsdns-13.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0