Crossword Genius

Pirate, 90, suffering a long time in here? (12)

Ross

I believe the answer is:

penitentiary

'a long time in here?' is the definition.
(type of prison - where people do time)

I don't understand the rest of the clue.

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

I've seen this clue in The Guardian.
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