Mine passage

I believe the answer is:

'mine passage' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for adit that I've seen before include "Taking passage" , "Da, it is a mine entrance" , "Horizontal mine passage" , "Almost horizontal mine shaft" , "Mine-shaft" .)

I've seen this clue in The Mirror and the Penny Press.

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