In fact, truly (6)
I believe the answer is:
indeed
This clue is a double definition.
'in fact' is the first definition.
(I've seen this before)
'truly' is the second definition.
(synonyms)
(Other definitions for indeed that I've seen before include "Without question" , "''A friend in need is a friend . . . . . .''" , "Really - truly" , "Yes, truthfully" , "In reality" .)