Gaol in San Francisco (8)

I believe the answer is:

alcatraz

(Other definitions for alcatraz that I've seen before include "Federal prison in California, 1934-63" , "Once dreaded prison in San Francisco Bay" , "Island in San Francisco Bay,once a prison" , "Old Calif. offshore prison" , "that caged bird mate?" .)

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

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