Correctional institution (4)

I think it could be either:

Which length description are you looking for?:

prison

'correctional institution' is the definition.
(I know that correctional institution is a type of correctional institution)

This is all the clue.

(Other definitions for prison that I've seen before include "Stir - can" , "Wormwood Scrubs, for example" , "Penitentiary" , "Jail" , "punishment" .)

I've seen this clue in The Irish Times.

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