Crossword Genius

Passage which Cockney has to be finished? (4)

Ross

I believe the answer is:

adit

'passage' is the definition.
(passage leading to a mine)

I don't understand how the remainder of the clue works.

(Other definitions for adit that I've seen before include "Passageway into a mine" , "Mine opening" , "Da, it is a mine entrance" , "Horiz. mine entrance" , "Mine-shaft" .)

I've seen this clue in The Times.
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