Crossword Genius

Certainly! (3)

Ross

'certainly' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for by all means that I've seen before include "using every possible method" , "expression of agreement" , "Be my guest!" , "Please do" , "how the versatile work?" .)

I've seen this clue in The Mirror and The Telegraph.
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