Crossword Genius

Fully confident (4)

Ross

I believe the answer is:

sure

'fully confident' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sure that I've seen before include "Completely certain" , "Certain, confident" , "stable" , "Positive" , "The old sewer" .)

I've seen this clue in the Newsday.
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