Crossword Genius

In action? Certainly (6)

Ross

I believe the answer is:

indeed

'certainly' is the definition.
(thesaurus)

'in action?' is the wordplay.
'action?' becomes 'deed' (deed is a kind of action**).
'in'+'deed'='INDEED'

(Other definitions for indeed that I've seen before include "Really, actually" , "still" , "Actually -- denied (anag)" , "Really - truly" , "Very much so" .)

I've seen this clue in The Telegraph.
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