Staff boy (3)
I believe the answer is:
rod
I believe this is a double definition.
'staff' is the first definition.
(thesaurus)
'boy' is the second definition.
(I have seen 'Little boy' mean 'rod' so perhaps 'boy' could also mean 'rod')
(Other definitions for rod that I've seen before include "Stick - bar" , "Stick, symbol of punishment" , "Long bar or pole" , "Thin straight bar" , "Baton, pole" .)