Look long at a lordly list (7)
I believe the answer is:
peerage
'lordly list' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'look long at a' is the wordplay.
'look' becomes 'peer' (to peer at something is to look at it).
'long' becomes 'ge' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'at' is a charade indicator (letters next to each other) (I've seen this in other clues).
'ge' put after 'a' is 'age'.
'peer'+'age'='PEERAGE'
Can you help me to learn more?
(Other definitions for peerage that I've seen before include "Lordly group" , "Book listing lords and the like" , "Book listing nobles" , "Dukes, earls, lords, ladies - the lot" , "Aristocracy" .)