Crossword Genius

Waste one plan for prison (7)

Ross

I believe the answer is:

dungeon

'prison' is the definition.
(thesaurus)

'waste one plan' is the wordplay.
'waste' becomes 'dung' (dung is a kind of waste**).
'plan' is an anagram indicator (plan can mean organise).
'one' anagrammed gives 'eon'.
'dung'+'eon'='DUNGEON'

'for' is the link.

(Other definitions for dungeon that I've seen before include "Uncongenial accommodation" , "Unpleasant cell" , "Eg, the Black Hole of Calcutta" , "Dark place of confinement" , "part of prison" .)

I've seen this clue in The Mirror.
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