True; real (7)
I believe the answer is:
factual
I believe this clue is a double definition.
'true' is the first definition.
(similar in meaning)
'real' is the second definition.
(synonyms)
(Other definitions for factual that I've seen before include "Related to the truth" , "Based on things known to be true" , "Relating to reality" , "like a TV documentary?" , "True-to-life" .)