Crossword Genius

Large underground chamber (6)

Ross

I believe the answer is:

cavern

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large underground chamber</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 Times and The Irish Times.
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