This could make me a lord! (7)
I believe the answer is:
'this' is the definition.
The definition suggests a singular noun which matches the answer.
'make me a lord' is the wordplay.
'make' indicates an anagram.
'mealord' is an anagram of 'EARLDOM'.
'could' acts as a link.
Can you help me to learn more?
(Other definitions for earldom that I've seen before include "What sort of noble has" , "Peer's domain" , "Lands of a nobleman" , "Aristocratic domain above a viscountcy but below a marquessate" , "Dignity" .)