Crossword Genius

Certainly popular act (6)

Ross

I believe the answer is:

indeed

'certainly' is the definition.
(thesaurus)

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

(Other definitions for indeed that I've seen before include "Certainly, quite so" , "even" , "Expression of interest, incredulity or contempt" , "Really; certainly" , "still" .)

I've seen this clue in The Times.
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