Mine or elevator passageway (5)
I believe the answer is:
shaft
This clue is a double definition.
'mine' is the first definition.
(I've seen this before)
'elevator passageway' is the second definition.
(I've seen this in another clue)
(Other definitions for shaft that I've seen before include "Beam - well" , "Arrow part" , "Ray of light; treat unfairly" , "Arrow; vertical mine entrance" , "Ray (of light), access to mine" .)