More certain (5)
I believe the answer is:
surer
'more certain' is the definition.
('sure' can be a synonym of 'certain')
This is the entire 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 Star Tribune, The Times, the Sydney Morning Herald, the Penny Press and the King Feature Syndicate.
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