Crossword Genius

Certainly one won't be! (2,5)

Ross

I believe the answer is:

in doubt

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If this is the answer I cannot explain how the clue works.

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(Other definitions for in doubt that I've seen before include "Dubious" , "far from fixed" , "Open to question" , "Uncertain" , "Undecided" .)

I've seen this clue in The Globe and Mail.
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