Below are possible answers for the crossword clue It's in action, certainly.
6 letter answer(s) to it's in action, certainly
INDEED
(used as an interjection) an expression of surprise or skepticism or irony etc.; "Wants to marry the butler? Indeed!"
in truth (often tends to intensify); "they said the car would break down and indeed it did"; "it is very cold indeed"; "was indeed grateful"; "indeed, the rain may still come"; "he did so do it!"
really
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