USA alliance (4)

I believe the answer is:

nato

'usa alliance' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for nato that I've seen before include "Military/political alliance" , "Atlantic alliance (abbr.)" , "Security agreement" , "N. Atlantic alliance" , "Military alliance (acronym)" .)

I've seen this clue in the Newsday.

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