Alliance acronym (4)

I believe the answer is:

nato

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

This is the entire clue.

(Other definitions for nato that I've seen before include "Collective security alliance engaged in Bosnia" , "Military bloc" , "Security agreement" , "Western mil. alliance" , "Military alliance, formed 1949" .)

I've seen this clue in the Newsday and the LA Times.

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