Waste a lot of time escaping from jail (4)

I believe the answer is:
dung
'waste' is the definition.
(dung is a kind of waste)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for dung that I've seen before include "Animal manure" , "Animal excrement" .)
I've seen this clue in The Independent.
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