— Islands, group in the Bismarck Archipelago in the South Pacific Ocean also known as the Manus Islands (9)

I believe the answer is:

admiralty

(Other definitions for admiralty that I've seen before include "UK state department in charge of the Royal Navy" , "Department of 1 across in charge of the Navy" , "HQ" , "Former Department in charge of the navy in Britain" .)

I've seen this clue in The Mirror.

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