Nicaragua managed without US base (4)

I believe the answer is:

guam

I'm a little stuck... Click here to teach me more about this clue!

'us base' is the definition.
(I've seen this before)

'nicaragua managed without' is the wordplay.
'GUAM' is hidden within the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

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

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

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