Harry him, boy! (6)
I believe the answer is:
potter
This might be a double definition.
'harry' is the first definition.
(Harry Potter)
'him boy' is the second definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
Can you help me to learn more?
(Other definitions for potter that I've seen before include "Maker of earthenware dishes" , "Hogwarts' Harry" , "Pootle" , "Producer of earthenware - move with little direction or energy" , "A maker of ceramics" .)