Contemporary (6)
I believe the answer is:
modern
'contemporary' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for modern that I've seen before include "'Contemporary, up-to-date (6)'" , "In history, the period or era since the Middle Ages" , "See 11" , "Fashionable (like the new Tate gallery?)" , "Novel" .)