Arrow part (5)
I believe the answer is:
shaft
'arrow part' is the definition.
('shaft' is part of 'arrow')
This is the entire clue.
(Other definitions for shaft that I've seen before include "Vertical passageway, into a mine say" , "Spear handle; ray of sun" , "Vertical mine access" , "Vertical excavation" , "Long rod or column of light" .)