Poisonous individual's extraordinary dig at NATO (5,4)

I believe the answer is:

giant toad

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'poisonous individual's' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'extraordinary dig at nato' is the wordplay.
'extraordinary' indicates an anagram.
'dig'+'at'+'nato'='digatnato'
'digatnato' anagrammed gives 'GIANT TOAD'.

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