Crossword Genius

Large underground chamber (6)

Ross

I believe the answer is:

cavern

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

This is all the clue.

(Other definitions for cavern that I've seen before include "Liverpool club where The Beatles started out" , "vast enclosed space" , "Subterranean chamber" , "Detection device" , "Large dark hole in the ground" .)

I've seen this clue in The Irish Times and The Times.
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