Island in San Francisco Bay that housed a federal prison until 1963 (8)

I believe the answer is:

alcatraz

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

I've seen this clue in The Mirror.

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