Crossword Genius

You can't be sure when nursing them (6)

Ross

I believe the answer is:

doubts

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(Other definitions for doubts that I've seen before include "Isn't certain about, has reservations" , "Thinks something unlikely" , "Uncertainties" , "Misgivings" , "Has reservations, is uncertain" .)

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