Crossword Genius

More certain (5)

Ross

I believe the answer is:

surer

'more certain' is the definition.
('sure' can be a synonym of 'certain')

This is all the clue.

(Other definitions for surer that I've seen before include "faster" , "more right?" , "More certain and positive" .)

I've seen this clue in the King Feature Syndicate, The Star Tribune and the Sydney Morning Herald.
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