One of the locals (3)
'one of the locals' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
This is all the clue.
Can you help me to learn more?
(Other definitions for pub that I've seen before include "Place to drink" , "free house?" , "Inn, tavern" , "Inn, hostelry" , "A familiar hostelry" .)
(Other definitions for resident that I've seen before include "Citizen" , "Inhabitant, occupant" , "always in memory" , "Lodger" , "Dwelling in a place for some time" .)