Crossword Genius

Not a crazy organisation (4)

Ross

I believe the answer is:

nato

'organisation' is the definition.
(NATO is an example)

'not a crazy' is the wordplay.
'crazy' indicates an anagram.
'not'+'a'='nota'
'nota' is an anagram of 'NATO'.

(Other definitions for nato that I've seen before include "Transatlantic alliance" , "US/Europe alliance" , "Military alliance (acronym)" , "Military organization" , "Atlantic alliance (abbr.)" .)

I've seen this clue in the Evening Standard.
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