Crossword Genius

Underground prison (7)

Ross

I believe the answer is:

dungeon

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">underground prison</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 dungeon that I've seen before include "Eg, the Black Hole of Calcutta" , "Unpleasant cell" , "Prison cell, often underground" , "Dark underground cell for prisoners" , "Place of confinement underground" .)

I've seen this clue in The Guardian, The Mirror and The Times.
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