Crossword Genius

Undefined organisation? (6,7)

Ross

I believe the answer is:

united nations

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'organisation?' is the definition.
(United Nations is an example)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for united nations that I've seen before include "peace group" , "International peace-keeping organisation" , "body" , "International peace organisation, founded 1945 in San Francisco" , "global organisation" .)

I've seen this clue in The Irish Independent.
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