Passage below ground (6)

I believe the answer is:

tunnel

'passage below ground' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for tunnel that I've seen before include "Sight defect" , "See 6" , "Let nun turn in the passage" , "(Soppy) fairground ride" , "Passage below ground" .)

I've seen this clue in The Irish Times.

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