Ray seen in mine passage (5)
I believe the answer is:
shaft
I believe this clue is a double definition.
'ray' is the first definition.
(I know that ray can be written as shaft)
'mine passage' is the second definition.
(I've seen this in another clue)
'seen in' acts as a link.
(Other definitions for shaft that I've seen before include "Vertical passage of mine" , "Vertical mine access" , "Aggressive remark" , "Ray (of light), access to mine" , "An arrow or a mine passage" .)