Crossword Genius

Waste very long time in underground prison (7)

Ross

I believe the answer is:

dungeon

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

'waste very long time' is the wordplay.
'waste' becomes 'dung' (dung is a kind of waste).
'very long time' becomes 'eon' (an extremely long period of time).
'dung'+'eon'='DUNGEON'

'in' is the link.

(Other definitions for dungeon that I've seen before include "Prison cell, often underground" , "Unpleasant cell" , "Eg, the Black Hole of Calcutta" , "Place of confinement underground" , "prison the result" .)

I've seen this clue in The Times.
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