Crossword Genius

Grouping welcomed by citizen at Odessa? (4)

Ross

I believe the answer is:

nato

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'grouping' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'welcomed by citizen at odessa?' is the wordplay.
'welcomed by' says the answer is hidden in the clue.
'NATO' can be found hidden inside 'citizen at odessa'.

Can you help me to learn more?

(Other definitions for nato that I've seen before include "Transatlantic alliance" , "International organisation for collective security" , "Military alliance, formed 1949" , "Collective security alliance engaged in Bosnia" , "Atlantic alliance (abbr.)" .)

I've seen this clue in The Independent.
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