Crossword Genius

Waste a lot of time in prison (7)

Ross

I believe the answer is:

dungeon

'prison' is the definition.
(a dungeon is a prison cell)

'waste a lot of time' is the wordplay.
'waste' becomes 'dung' (dung is a kind of waste).
'a lot of time' becomes 'eon' (I've seen this in another clue).
'dung'+'eon'='DUNGEON'

'in' is the link.

(Other definitions for dungeon that I've seen before include "Eg, the Black Hole of Calcutta" , "old prison" , "prison the result" , "Place of confinement underground" , "Dark place of confinement" .)

I've seen this clue in The Independent and the Sydney Morning Herald.
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