In truth (6)
'in truth' is the definition.
(synonyms)
This is all the clue.
(Other definitions for indeed that I've seen before include "Really; certainly" , "Word expressing surprise, disbelief, etc" , "Really, actually" , "Certainty" , "Expression of interest, incredulity or contempt" .)
'in truth' is the definition.
(truthfully)
This is all the clue.
(Other definitions for really that I've seen before include "Actually, honest to God" , "Go on" , "Well I never!" , "Truly, in fact" , "Indeed" .)