Crossword Genius

Underground passage (6)

Ross

I think it could be either:

subway

tunnel

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

This is all the clue.

(Other definitions for subway that I've seen before include "New York city trains" , "American tube" , "New York underground" , "Passage under a road" , "Pedestrian tunnel under a road" .)

I've seen this clue in the Sydney Morning Herald, the Family Time, The Guardian, the Irish Times (Simplex), the Evening Standard, The Times, the USA Today, The Independent and The Telegraph.
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