Crossword Genius

In fact in the act (6)

Ross

I believe the answer is:

indeed

'in fact' is the definition.

'in the act' is the wordplay.
'the 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" , "Surely" , "Really, without doubt" , "To be sure" , "Word expressing surprise, disbelief, etc" .)

I've seen this clue in The Telegraph.
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