Crossword Genius

75% of prison is empty (6)

Ross

I believe the answer is:

hollow

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'is empty' is the definition.
(synonyms)

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(Other definitions for hollow that I've seen before include "Pyrrhic" , "Not solid, having hole in the middle" , "Empty - hole" , "Having an empty space inside" , "Having a cavity inside" .)

I've seen this clue in The Guardian.
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