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Not certain (6)

Ross

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unsure

'not certain' is the definition.
('unsure' is the opposite to 'certain')

This is all the clue.

(Other definitions for unsure that I've seen before include "Not certain, dubious" , "Not certain or decided" , "regarded as somewhat precarious" , "Not certain, doubtful" , "self-confidence" .)

I've seen this clue in The Guardian, The Telegraph, The Irish Times, The Times and the Sydney Morning Herald.
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