US prison (12)

I think it could be either:

Which length description are you looking for?:

4,4

penitentiary

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

This is all the clue.

(Other definitions for penitentiary that I've seen before include "US prison" , "Senior Catholic" , "American prison" , "stir" .)

I've seen this clue in The Times, The Independent and The Telegraph.

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