An officer's entitlement (3)
I believe the answer is:
sir
This clue might be a double definition.
'an officer's' is the first definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'entitlement' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
Can you help me to learn more?
(Other definitions for sir that I've seen before include "Knight's prefix" , "Formal term of address" , "Polite term of address for a man" , "Noble title of undesirable kind" , "Gentleman's form of address" .)