Pacific island; capital Hagatna (4)

I believe the answer is:

guam

(Other definitions for guam that I've seen before include "place in the Marianas" , "NW Pacific island with large US base" , "US island east of the Philippines" , "North Pacific island, base for the US navy and air force" , "Largest of the Mariana Islands" .)

I've seen this clue in The Mirror.

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