San Francisco penitentiary (8)

I believe the answer is:

alcatraz

(Other definitions for alcatraz that I've seen before include "Once dreaded prison in San Francisco Bay" , "US island of a former maximum-security prison" , "Californian island" , "Once-notorious prison in San Francisco Bay" , "US island, formerly a famous prison" .)

I've seen this clue in the Sydney Morning Herald.

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