Narrow beam in mine entrance (5)

I believe the answer is:

shaft

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This might be a double definition.

'narrow beam' is the first definition.
'shaft' can be an answer for 'beam' (synonyms). I'm not sure about the 'narrow' bit.

'mine entrance' is the second definition.
'shaft' can be an answer for 'mine' (I've seen this before). I'm not certain of the 'entrance' bit.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for shaft that I've seen before include "An arrow or a mine passage" , "Mine access; handle" , "Ray (of light), access to mine" , "Vertical excavation" , "Vertical passage of mine" .)

I've seen this clue in The Times.

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