Crossword Genius

Certainly! (3)

Ross

'certainly' is the definition.
(I know that certainly can be written as sure)

This is all the clue.

(Other definitions for sure that I've seen before include "Positive" , "Convinced" , "of course" , "Completely confident that one is right" , "Definite" .)

I've seen this clue in The Mirror.
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