Crossword Genius

Rogue nation, if kept under threat (2,10)

Ross

I think it could be either:

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2,5,5

2,10

at knifepoint

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'under threat' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'rogue nation if kept' is the wordplay.
'rogue' indicates an anagram (letters go rogue).
'nation'+'if'+'kept'='nationifkept'
'nationifkept' anagrammed gives 'AT KNIFEPOINT'.

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I've seen this clue in The Guardian.
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