Crossword Genius

Brussels-based alliance (4)

Ross

I believe the answer is:

nato

'brussels-based alliance' 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 "Atlantic alliance (abbr.)" , "International organisation for collective security" , "Security agreement" , "Transatlantic alliance" , "Military organization" .)

I've seen this clue in The Washington Post and The Wall Street Journal.
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