Crossword Genius

Convinced, and then some (8)

Ross

I believe the answer is:

cocksure

(Other definitions for cocksure that I've seen before include "Very confident like male fowl" , "The fowl begins to be offensively certain." , "Foolishly over-confident" , "Offensively confident" , "Arrogantly certain" .)

I've seen this clue in the Newsday.
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